Feline Leukemia Virus

Feline leukemia virus, commonly known as FeLV, represents one of the most significant infectious disease threats facing domestic cats, causing progressive deterioration of the immune system and bone marrow that ultimately proves fatal in persistently infected cats. This retrovirus belongs to the same viral family as feline immunodeficiency virus and human immunodeficiency virus, sharing the characteristic of integrating its genetic material into host cells where it persists and causes ongoing damage over time. Cat owners need comprehensive understanding of FeLV because it remains a leading infectious cause of death in cats despite decades of prevention efforts, affecting approximately two to three percent of cats overall and substantially higher percentages in high-risk populations. Early detection through testing, prevention through vaccination and exposure avoidance, and appropriate management of infected cats all depend on owner education about this serious but manageable condition.

The prevalence of feline leukemia virus has decreased significantly over the past several decades due to widespread testing, vaccination programs, and improved understanding of transmission that has enabled better prevention practices. Current estimates suggest FeLV affects approximately 2 to 3 percent of healthy cats in North America and Europe, with prevalence reaching 30 percent or higher in some high-risk populations including outdoor cats, cats in multi-cat households with infected residents, and cats in shelters with inadequate testing protocols. The virus affects cats of all breeds without genetic predisposition, though certain lifestyle factors dramatically increase exposure risk for individual cats. Age significantly influences infection outcomes, with kittens facing the highest risk of developing persistent, lifelong infection if exposed, while adult cats may clear the virus through effective immune responses in many cases. Geographic variation in prevalence reflects differences in outdoor cat populations, vaccination rates, and regional shelter practices.

The severity of feline leukemia virus infection varies depending on infection outcome category, with some cats clearing the virus completely, others developing latent infection that may or may not reactivate, and still others developing progressive infection that invariably proves fatal without intervention. Cats who develop progressive FeLV infection experience gradual immune system destruction, increased susceptibility to secondary infections, development of FeLV-associated cancers particularly lymphoma and leukemia, severe anemia, and ultimately death within two to three years on average, though individual survival varies considerably. Some cats achieve what veterinarians call regressive infection, where the immune system controls viral replication and the virus becomes undetectable, though it may persist in tissues and potentially reactivate under certain circumstances. The prognosis for individual cats depends heavily on infection category, presence of complications, access to veterinary care, and management quality, with even progressively infected cats potentially maintaining good quality of life for extended periods with appropriate care.

Cats infected with FeLV present unique challenges because they may appear completely healthy for months to years during an asymptomatic carrier phase before developing clinical disease, and because their tendency to hide illness means early symptoms often go unrecognized by even attentive owners. During the asymptomatic phase, infected cats shed virus and can transmit infection to others while showing no outward signs of illness themselves, making testing rather than observation the only reliable way to identify infected cats. As disease progresses, subtle early signs including minor weight loss, slightly decreased appetite, and reduced energy may be attributed to aging or other factors rather than recognized as indications of developing FeLV-related disease. Understanding that apparently healthy cats may be infected and infectious underscores the importance of testing all cats, regardless of appearance, to identify infection and enable appropriate management decisions.

This comprehensive guide provides cat owners with essential information about feline leukemia virus, from transmission and testing through diagnosis, treatment, and long-term management of infected cats. Readers will learn how FeLV spreads between cats and what factors increase exposure risk, enabling implementation of effective prevention strategies. Detailed information about testing helps owners understand when testing is appropriate and how to interpret results. For owners of FeLV-positive cats, guidance on treatment options, home care, and long-term management supports maximizing quality of life and survival time. Prevention strategies including vaccination and exposure avoidance protect uninfected cats from this serious disease. Armed with comprehensive knowledge, cat owners can make informed decisions about testing, prevention, and care that protect their cats and support the broader goal of reducing FeLV prevalence in cat populations.

Feline leukemia virus transmission occurs primarily through prolonged close contact between infected and susceptible cats, with saliva representing the primary vehicle for viral spread between individuals. The virus is present in high concentrations in saliva, nasal secretions, urine, feces, and milk of infected cats, though saliva contains the highest viral loads and provides the most efficient transmission route. Common transmission scenarios include mutual grooming, shared food and water bowls, bite wounds during fighting, and nursing from infected mothers to kittens. Unlike some other cat diseases, FeLV does not spread efficiently through brief casual contact, requiring instead the sustained close contact that occurs between cats sharing living spaces or engaging in extended social interactions. The virus survives only briefly outside the host, typically dying within hours in normal environmental conditions, which limits environmental contamination as a significant transmission route.

Genetic factors influence individual cats' susceptibility to persistent FeLV infection following exposure, with some cats possessing immune system characteristics that enable viral clearance while others lack effective antiviral responses. Research has identified that approximately 30 to 40 percent of adult cats exposed to FeLV successfully clear the infection through effective immune responses, never developing persistent viremia or becoming significant transmission risks. The genetic and immunological factors that determine which cats clear infection versus developing progressive disease remain incompletely characterized but likely involve variations in major histocompatibility complex genes and other immune system components. No breed-specific susceptibility to FeLV infection has been documented, with exposure factors rather than genetic factors primarily determining which cats become infected. Age at exposure significantly influences infection outcome, with kittens under four months showing the highest rates of progressive infection development, likely due to their immature immune systems' inability to mount effective antiviral responses.

Environmental factors play crucial roles in FeLV transmission risk, with outdoor access representing the single most important modifiable factor that determines whether cats encounter potentially infected individuals. Cats with outdoor access face dramatically elevated exposure risk compared to strictly indoor cats because outdoor environments bring contact with stray, feral, and neighborhood cats whose FeLV status is unknown and may include infected individuals actively shedding virus. Multi-cat households present variable risk depending on whether all cats are tested negative and whether new cats are introduced without testing, with risk essentially zero in closed, tested-negative households but potentially significant if infected cats are present or if residents have outdoor access. Shelters, catteries, and boarding facilities where cats from multiple sources congregate present elevated transmission risk, particularly in facilities without adequate testing and isolation protocols. Geographic location influences exposure risk through regional variation in FeLV prevalence among outdoor cat populations.

Age-related factors profoundly influence both FeLV exposure patterns and infection outcomes following viral encounter, with kittens facing the highest vulnerability to developing progressive lifelong infection. Kittens under four months of age lack mature immune responses capable of effectively controlling FeLV replication, and approximately 100 percent of neonatal kittens exposed to FeLV develop progressive infection compared to much lower rates in adult cats. Vertical transmission from infected mothers to kittens occurs through in utero infection, exposure during birth, and nursing, with infected queens transmitting the virus to most or all of their offspring. Young adult cats in the one to five year range with outdoor access face peak exposure risk due to territorial and social behaviors that bring contact with potentially infected cats during fighting or friendly interactions. Adult cats exposed to FeLV clear the infection in approximately 30 to 40 percent of cases, develop regressive controlled infection in some cases, and develop progressive infection in remaining cases, with outcomes influenced by exposure dose and individual immune function.

Diet and lifestyle factors influence both exposure risk and infection outcomes through their effects on immune function and behaviors that affect contact with potentially infected cats. Nutritional status affects immune system function, with well-nourished cats better equipped to mount effective antiviral responses than cats with marginal nutrition, though this factor is secondary to age and exposure intensity in determining infection outcomes. Intact reproductive status dramatically increases exposure risk, particularly in males, because intact cats range more widely, engage in more fighting, and have more contact with other cats compared to neutered cats. Stress impairs immune function through well-documented hormonal pathways and may increase susceptibility to persistent infection in exposed cats while potentially accelerating disease progression in infected cats. Indoor versus outdoor lifestyle represents the lifestyle factor with greatest impact on exposure risk, with strictly indoor cats facing negligible risk while outdoor cats face ongoing exposure potential.

Other risk factors contributing to FeLV infection and disease progression include concurrent health conditions, vaccination status of exposed cats, and viral factors including exposure dose and strain characteristics. Cats with pre-existing immunocompromising conditions including FIV co-infection experience accelerated FeLV disease progression and worse outcomes than cats infected with FeLV alone. Vaccination before exposure significantly reduces infection risk, though protection is not absolute and varies among vaccine products and individuals. The dose of virus encountered during exposure influences infection outcome, with high-dose exposures more likely to overwhelm immune defenses and establish persistent infection than lower-dose exposures. Regional variation in prevalent FeLV strains may influence disease characteristics, though all FeLV strains cause similar disease syndromes. Previous exposure that resulted in viral clearance may provide some natural immunity against subsequent exposure, though relying on natural immunity rather than vaccination and exposure prevention is not recommended.

Early warning signs of feline leukemia virus infection are typically absent during the initial asymptomatic phase that may last months to years following infection, making testing rather than symptom observation the only reliable method for early detection. Some cats may show transient mild illness during the acute phase of initial infection, with symptoms including mild fever, lethargy, and enlarged lymph nodes that resolve spontaneously as the initial immune response develops. Most owners never recognize these subtle acute signs, and cats quickly return to apparently normal health regardless of whether they will ultimately clear the virus or develop persistent infection. The first indications of progressive disease often include vague nonspecific changes such as gradually declining energy, subtle weight loss, or slightly reduced appetite that may be attributed to aging or other factors. Recurrent minor illnesses that seem to occur more frequently or resolve more slowly than expected may provide early clues that immune function is becoming compromised.

Common symptoms in cats with progressive FeLV infection reflect the immune system's declining ability to protect against secondary infections, the direct effects of viral infection on bone marrow and other tissues, and the development of FeLV-associated cancers in some cats. Increased susceptibility to infections manifests as recurrent respiratory infections, skin infections, urinary tract infections, or other bacterial, viral, and fungal infections that occur more frequently and respond less completely to treatment than in immunocompetent cats. Oral disease including severe gingivitis and stomatitis affects many FeLV-positive cats, causing painful red gums, difficulty eating, drooling, and refusal of hard foods. Anemia resulting from bone marrow suppression or immune-mediated red blood cell destruction causes pale gums, weakness, lethargy, and exercise intolerance. Weight loss and muscle wasting occur progressively despite adequate food intake in many cats as disease advances. Fever may occur during active infections or as a direct effect of FeLV infection on temperature regulation.

Behavioral changes accompanying FeLV infection often provide important early indicators of declining health that owners may notice before obvious physical symptoms develop. Gradually increasing lethargy represents one of the most commonly reported changes, with affected cats sleeping more, playing less, and showing decreased interest in activities they previously enjoyed. Social behavior changes include withdrawal from family interaction, decreased greeting behavior, and increased time spent hiding in quiet areas away from household activity. Appetite changes may include decreased food interest, reluctance to eat hard foods due to oral pain, or changes in food preferences. Grooming behavior often declines as cats feel unwell, resulting in unkempt coats, matting, and visible dirt accumulation. Activity level decreases may be gradual enough that owners attribute changes to aging rather than recognizing illness progression. Personality changes including increased irritability, decreased tolerance for handling, or unusual anxiety may reflect discomfort from various FeLV-related conditions.

Physical signs observable during veterinary examination or careful owner observation provide objective evidence of disease progression and help guide diagnostic and treatment decisions. Weight loss with visible muscle wasting over the spine, hips, and shoulders indicates progressive disease affecting nutritional status and metabolism. Pale gums indicating anemia represent one of the most important physical findings suggesting advanced disease requiring aggressive management. Enlarged lymph nodes palpable throughout the body reflect immune system activation and may suggest lymphoma development in some cases. Oral examination commonly reveals severe gingivitis, stomatitis, or ulcerations that contribute to eating difficulties. Abdominal palpation may detect enlarged organs, abdominal masses, or fluid accumulation depending on specific disease manifestations. Eye abnormalities including inflammation within the eye, pupil changes, or visible masses may occur with certain FeLV-associated conditions. Skin examination may reveal poor coat condition, slow-healing wounds, or unusual skin infections.

Symptom progression in FeLV-positive cats varies considerably depending on individual factors, specific disease manifestations, and quality of ongoing management and care. Following the variable-length asymptomatic phase, symptomatic disease typically progresses gradually over months, with cats experiencing slowly worsening baseline health punctuated by acute illness episodes from secondary infections. Some cats develop rapidly progressive disease including aggressive lymphoma or severe non-regenerative anemia that causes dramatic deterioration over days to weeks. Others maintain relatively stable chronically ill status for extended periods with appropriate supportive care. Emergency indicators requiring immediate veterinary attention include severe weakness or collapse, difficulty breathing, complete food refusal exceeding 24 hours, severe anemia causing extremely pale gums, bleeding disorders, or obvious rapid deterioration from previous baseline. Understanding that FeLV disease courses vary widely helps owners interpret their individual cats' symptom patterns while remaining alert for changes requiring veterinary evaluation.

Veterinary examination for feline leukemia virus infection encompasses both testing for the virus itself and comprehensive evaluation of overall health status to assess disease stage and identify complications requiring treatment. History-taking explores potential exposure risks, any illness episodes, symptom progression, and vaccination history that might influence test interpretation. Physical examination systematically evaluates body condition, lymph node status, mucous membrane color, oral health, and overall condition while seeking evidence of secondary infections or other complications. Your veterinarian will discuss testing options, explain how results will be interpreted, and outline management recommendations for different possible outcomes. For cats already known to be FeLV-positive presenting for illness, examination focuses on identifying specific problems requiring treatment while assessing overall disease progression. This comprehensive approach ensures both accurate diagnosis and appropriate treatment planning.

Diagnostic testing for FeLV employs several methodologies that detect different aspects of infection and serve different purposes in clinical decision-making. Point-of-care ELISA testing detects FeLV p27 antigen in blood samples and provides rapid results during a single veterinary visit, serving as the primary screening test for FeLV status determination. Positive ELISA results should be confirmed with additional testing because occasional false positives occur, and confirming persistent versus transient infection affects prognosis and management significantly. Indirect immunofluorescent antibody testing detects virus within white blood cells and indicates bone marrow infection that suggests progressive infection when positive. PCR testing detects proviral DNA integrated into host cells and can identify infection in some cats with negative antigen tests, indicating regressive or latent infection. Serial testing over several months may be recommended for cats with initial positive results to distinguish progressive persistent infection from transient or regressive infection that may resolve. Monitoring blood work including complete blood counts helps assess disease progression through tracking of anemia, white blood cell changes, and platelet counts.

Treatment options for FeLV-positive cats focus on managing complications, supporting immune function, and maintaining quality of life rather than eliminating the virus, as no consistently effective cure exists for established FeLV infection. Secondary infections require aggressive antimicrobial treatment, often with longer courses and sometimes with different drug choices than would be used in immunocompetent cats. Antiviral medications including interferon and other immunomodulatory agents have been investigated with variable results, and some veterinarians incorporate these into management protocols despite limited evidence for consistent efficacy. Blood transfusions may be necessary for cats with severe anemia, providing temporary improvement while other treatments address underlying causes. Cancer treatment including chemotherapy may be appropriate for some cats who develop FeLV-associated lymphoma or other malignancies, with treatment decisions balancing potential benefit against side effects and quality of life. Supportive care including appetite stimulants, antiemetics, and nutritional support helps maintain body condition during illness episodes.

Home care for FeLV-positive cats encompasses infection prevention, stress reduction, nutritional support, and monitoring that supports long-term management between veterinary visits. Keeping FeLV-positive cats strictly indoors protects their compromised immune systems from additional pathogen exposure while preventing transmission to other cats in the environment. Feeding high-quality, nutritionally complete commercial diets supports immune function while avoiding raw food that could introduce bacterial pathogens dangerous to immunocompromised cats. Stress reduction through stable routines, appropriate environmental enrichment, and minimizing household disruptions supports immune function through psychological wellbeing. Maintaining excellent parasite prevention reduces immune challenges from parasites that healthy cats might tolerate but that stress compromised immune systems. Monitoring food intake, water consumption, body weight, activity level, and overall condition enables early detection of declining health requiring veterinary intervention. Isolating FeLV-positive cats from FeLV-negative housemates prevents transmission, though stable households with both positive and negative cats can sometimes be maintained with careful management.

Recovery expectations for FeLV-positive cats depend heavily on infection category and specific complications, with outcomes ranging from years of stable health to rapid deterioration depending on individual circumstances. Cats with regressive infection who control viral replication may maintain normal health indefinitely and may even be considered functionally cured, though reactivation remains possible. Cats with progressive infection typically survive two to three years on average following diagnosis, though individual variation is substantial with some cats living longer with excellent care and others deteriorating more rapidly. Quality of life rather than survival duration should guide management decisions, with treatment goals focused on maintaining comfort, normal activities, and enjoyable daily life rather than simply extending survival. Regular veterinary monitoring every three to six months allows assessment of disease progression and timely intervention for developing complications. Open communication with your veterinary team about prognosis, quality of life, and end-of-life considerations helps prepare for decisions that may eventually be necessary.

Cost considerations for FeLV-positive cat care vary considerably based on disease stage, complications present, and intensity of management pursued. Initial diagnostic testing including screening and confirmatory tests typically costs 75 to 200 dollars depending on methodology and laboratory fees. Routine monitoring visits with blood work every three to six months may cost 150 to 300 dollars per visit. Treatment costs during illness episodes range from modest expenses for simple antibiotic courses to substantial costs for hospitalization, blood transfusions, or cancer treatment. Specialty care referrals for complicated cases add consultation fees and potentially expensive advanced treatments. Monthly preventive care including parasite prevention and high-quality nutrition represents ongoing expenses. Pet insurance obtained before FeLV diagnosis may cover subsequent care expenses, though pre-existing condition exclusions typically apply to FeLV-related conditions specifically. Many owners find that maintaining FeLV-positive cats in stable condition is financially manageable during asymptomatic periods, with costs escalating during symptomatic episodes that require intensive intervention.

Prevention of feline leukemia virus infection relies on a comprehensive strategy combining vaccination for at-risk cats, testing to identify infected cats before they can transmit to others, and exposure prevention that limits contact between susceptible cats and potential virus sources. Vaccination provides significant protection against FeLV infection and is recommended for all cats at risk of exposure, including cats with outdoor access, cats living with FeLV-positive housemates, and kittens whose future lifestyle cannot be predicted. Testing all cats for FeLV enables identification of infected individuals who can then be managed to prevent transmission while receiving appropriate care for their condition. Keeping cats indoors eliminates the primary exposure pathway by preventing contact with infected outdoor cats. This multi-pronged approach has proven effective at reducing FeLV prevalence in cat populations where consistently implemented, and individual cat owners can substantially protect their own cats by applying these principles.

Diet and environmental management support both prevention of infection in at-risk cats and optimal health maintenance in cats already infected with FeLV. Nutritional support through high-quality, complete and balanced commercial diets provides nutrients necessary for optimal immune function in both susceptible and infected cats. Avoiding raw diets in FeLV-positive cats prevents exposure to foodborne pathogens that their compromised immune systems cannot handle safely. Maintaining ideal body weight through appropriate feeding supports metabolic health and immune function. Environmental enrichment reduces stress that impairs immune function, benefiting both at-risk cats and infected cats whose immune systems face additional challenges. Indoor housing eliminates exposure risk for uninfected cats while protecting infected cats from additional pathogens and preventing transmission to outdoor cat populations. Creating stable, predictable environments with adequate resources reduces chronic stress that negatively affects immune function.

Regular monitoring for both at-risk cats and FeLV-positive cats enables early detection of problems and timely intervention that can significantly improve outcomes. Uninfected cats at ongoing risk should be tested periodically, with frequency depending on exposure level, to detect any infections acquired since previous testing. FeLV-positive cats benefit from veterinary monitoring every three to six months to assess disease progression, identify developing complications early, and adjust management strategies as needed. Home monitoring including tracking weight, appetite, activity, and overall condition provides continuous surveillance between veterinary visits. Keeping records of observations, veterinary findings, and treatment responses helps track patterns over time. For FeLV-positive cats, monitoring for specific complications including anemia, infection susceptibility, and cancer development enables early intervention when problems are most treatable. Regular dental assessment is particularly important given the high frequency of severe oral disease in FeLV-positive cats.

Long-term management of FeLV-positive cats requires ongoing commitment to care routines, veterinary relationships, and quality of life focus throughout the disease course that may extend several years from diagnosis. Many FeLV-positive cats maintain good quality of life for extended periods with appropriate management, and quality rather than quantity of life should guide treatment decisions. Keeping cats indoors, maintaining current vaccinations against other diseases, providing excellent nutrition, and minimizing stress form the foundation of ongoing management. Prompt veterinary attention for any illness prevents minor problems from becoming serious in cats whose immune systems cannot control infections as effectively as healthy cats. Building strong veterinary relationships ensures ongoing access to expertise as disease evolves and challenges arise. Social considerations include keeping FeLV-positive cats separated from negative housemates to prevent transmission while ensuring positive cats receive adequate social interaction and enrichment. Planning for potential progression, including discussing likely disease trajectories and considering end-of-life options in advance, helps owners prepare for decisions they may face.

Support resources for owners of FeLV-positive cats include veterinary specialists, educational materials, online communities, and organizations that can help navigate the challenges of managing this serious but manageable condition. Veterinary internal medicine specialists provide expertise for complex cases, unusual disease manifestations, or cats failing standard management approaches. Veterinary oncologists can guide treatment decisions for cats who develop FeLV-associated cancers. Educational resources from veterinary organizations, schools, and reputable pet health websites provide evidence-based information about disease management and prognosis. Online communities dedicated to FeLV-positive cat care offer emotional support and practical tips from others managing similar situations, though medical information should be verified with veterinary professionals. Some rescue organizations specialize in FeLV-positive cats and can provide guidance on management strategies they have found effective. Your primary care veterinarian remains your most accessible ongoing resource for questions, concerns, and coordination of any specialty care needed.

Emergency signs in FeLV-positive cats requiring immediate veterinary attention include severe symptoms suggesting acute life-threatening complications that require immediate stabilization and treatment. Severe weakness, collapse, or inability to stand indicates serious systemic illness requiring emergency evaluation, potentially reflecting severe anemia, overwhelming infection, or other critical complications. Difficulty breathing characterized by open-mouth breathing, extreme respiratory effort, or blue-tinged gums represents respiratory emergency requiring immediate intervention. Severe pale gums indicating profound anemia require emergency assessment and potentially blood transfusion. Complete refusal to eat or drink for more than 24 hours, particularly with other symptoms, demands prompt attention before complications develop. Seizures, severe disorientation, or dramatic neurological changes require immediate evaluation. Obvious rapid deterioration from previous baseline over hours to days indicates acute crisis requiring emergency care. Bleeding disorders manifesting as unusual bruising, blood in urine or stool, or bleeding from gums require urgent attention.

Urgent signs in FeLV-positive cats warranting same-day or next-day veterinary evaluation include moderate symptoms suggesting significant illness or concerning changes from baseline that require professional assessment. Moderate lethargy representing clear change from normal activity level suggests developing problems requiring evaluation. Decreased appetite lasting more than one to two days warrants attention before nutritional complications develop. Fever detectable as warm ears and nose or confirmed by temperature measurement indicates active infection or other inflammatory process. New respiratory symptoms including increased sneezing, nasal discharge, or coughing suggest developing respiratory infection. Vomiting or diarrhea lasting more than 24 hours requires evaluation for cause and supportive care. Visible oral problems including red gums, drooling, or obvious eating difficulty indicate painful mouth conditions requiring treatment. Weight loss noticed over weeks to months indicates disease progression requiring reassessment. New lumps, bumps, or enlarged lymph nodes warrant evaluation for potential lymphoma or other masses.

FeLV-positive cats require heightened vigilance because their compromised immune systems may allow problems to progress more rapidly than in healthy cats, making earlier intervention particularly important. Minor symptoms that might resolve spontaneously in healthy cats may progress to serious illness in FeLV-positive cats without treatment, justifying lower thresholds for veterinary consultation. Changes you might dismiss as insignificant in other contexts warrant attention and potential evaluation in FeLV-positive cats. When uncertain whether symptoms justify veterinary visits, err on the side of seeking evaluation given the potentially serious consequences of delayed treatment in immunocompromised cats. Calling your veterinary clinic to describe observations allows trained staff to help assess urgency and determine appropriate response. Establishing baseline normal for your individual FeLV-positive cat and noting any deviations enables earlier detection of developing problems. Regular scheduled monitoring visits provide opportunities to discuss any concerns even when no specific symptoms are present.

Your role as primary observer and advocate for your FeLV-positive cat directly influences their health outcomes and quality of life throughout their disease course. You see your cat daily and understand their individual patterns of eating, activity, behavior, and overall wellbeing far better than veterinary professionals who see them periodically, positioning you to detect changes that signal developing problems. Maintaining awareness of your cat's baseline normal across multiple parameters enables recognition of subtle changes that warrant attention. Your willingness to seek veterinary evaluation when concerns arise, even for changes that seem minor, ensures problems are addressed early when most treatable. Communicating effectively with your veterinary team about your observations, concerns, and goals helps ensure care decisions align with your values and your cat's best interests. Committing to ongoing management requirements including monitoring, preventive care, and treatment compliance directly affects your cat's quality of life and survival. Your FeLV-positive cat depends entirely on your dedication to their care, trusting that you will recognize when they need help and ensure they receive appropriate medical attention.