Lungworms

Lungworms represent a significant parasitic threat to canine respiratory health, caused by various species of parasitic nematodes that inhabit the airways and lung tissue of infected dogs. The most clinically important species affecting dogs include Angiostrongylus vasorum, commonly known as French heartworm, Crenosoma vulpis, and Oslerus osleri. These parasites have complex life cycles typically involving intermediate hosts such as snails and slugs, which dogs may inadvertently consume while exploring their environment. Lungworm infections have become increasingly recognized as a serious health concern in many regions worldwide, with prevalence rates varying significantly based on geographic location and local wildlife populations.

The pathophysiology of lungworm infection varies depending on the specific parasite species involved. Angiostrongylus vasorum larvae migrate through the intestinal wall after ingestion and travel to the heart and pulmonary arteries where they mature into adults. These adult worms produce eggs that hatch into larvae within the lung tissue, causing significant inflammation and damage. Crenosoma vulpis adults reside directly in the bronchi and trachea, while Oslerus osleri forms nodules at the tracheal bifurcation. This parasitic presence triggers inflammatory responses that can severely compromise respiratory function and, in some cases, affect blood clotting mechanisms.

The impact of lungworm infection on canine health can range from mild respiratory symptoms to life-threatening complications. Dogs with heavy parasite burdens may experience severe respiratory distress, exercise intolerance, and in cases involving Angiostrongylus vasorum, potentially fatal bleeding disorders due to the parasite's effects on the coagulation system. The condition is particularly dangerous because early symptoms can be subtle and easily overlooked, allowing the infection to progress before diagnosis. Young dogs and those with compromised immune systems may be especially vulnerable to severe disease manifestations.

Fortunately, lungworm infections are treatable when diagnosed promptly, with several effective antiparasitic medications available. However, the key to successful outcomes lies in early detection and appropriate veterinary intervention. Prevention through regular parasite control protocols has become increasingly important as awareness of lungworm prevalence has grown. Pet owners should understand that lungworm infection is not directly contagious between dogs but requires environmental exposure to infected intermediate hosts, making certain lifestyle factors significant risk determinants for this parasitic disease.

The primary cause of lungworm infection in dogs is the ingestion of parasitic larvae, typically through consuming infected intermediate hosts or through environmental contamination. The life cycle of lungworms is indirect, meaning the parasites require an intermediate host to complete their development before becoming infectious to dogs. Snails and slugs serve as the primary intermediate hosts for most lungworm species, harboring the infective larvae within their tissues. Dogs become infected when they intentionally or accidentally consume these mollusks while exploring outdoors, eating grass, drinking from puddles, or playing with toys that have been in contact with snails or slugs.

Angiostrongylus vasorum, the most pathogenic lungworm affecting dogs, has a particularly complex life cycle that contributes to its ability to cause severe disease. After a dog ingests infected larvae, they penetrate the intestinal wall and migrate through the lymphatic system and blood vessels to reach the right side of the heart and pulmonary arteries. Here, the larvae mature into adult worms over approximately six weeks, at which point they begin producing eggs. These eggs are carried to the lungs where they lodge in small capillaries, hatch into first-stage larvae, and are coughed up, swallowed, and passed in the feces to continue the cycle.

Environmental factors play a crucial role in lungworm transmission and prevalence. Warm, moist conditions favor the survival and activity of snails and slugs, making certain geographic regions and seasons higher risk periods for infection. Areas with abundant wildlife, particularly foxes which serve as natural reservoir hosts for Angiostrongylus vasorum, tend to have higher environmental contamination levels. Climate change has been implicated in the expanding range of lungworms, with previously unaffected regions now reporting cases as temperatures become more favorable for intermediate host populations.

Risk factors for lungworm infection extend beyond simple environmental exposure. Dogs with outdoor access, particularly those that exhibit exploratory behavior such as eating grass, investigating garden areas, or consuming found objects, face elevated infection risk. Younger dogs and puppies may be more prone to infection due to their curious nature and tendency to mouth objects in their environment. Dogs that hunt or have access to wildlife carcasses may also have increased exposure opportunities. Additionally, dogs living in multi-dog households where one animal is infected may face indirect risk through shared water bowls or outdoor areas contaminated with infected feces.

The mechanism of disease development following infection involves both direct tissue damage and host immune responses. As larvae migrate through tissues and adult worms establish themselves in the cardiovascular system, they cause mechanical damage and trigger inflammatory reactions. The presence of worms and eggs in the pulmonary vasculature leads to arteritis, thrombosis, and parenchymal lung damage. In cases of Angiostrongylus vasorum infection, the parasite also produces substances that interfere with normal blood clotting, leading to the potentially fatal coagulopathy that distinguishes this species from other lungworms.

Early warning signs of lungworm infection can be subtle and easily attributed to other common conditions, making owner awareness crucial for timely diagnosis. The initial symptoms often include a mild, intermittent cough that may be dismissed as a minor irritation or kennel cough. Some dogs develop exercise intolerance before obvious respiratory symptoms appear, showing reluctance to engage in physical activity or tiring more quickly than usual during walks and play. Slight changes in breathing patterns, such as increased respiratory rate at rest or mild respiratory effort, may also be present in the early stages. These subtle signs warrant veterinary attention, particularly in areas where lungworm is prevalent.

Common respiratory symptoms become more apparent as the infection progresses and parasite burden increases. A persistent cough is the hallmark sign of lungworm infection, often described as harsh, hacking, or gagging in nature. The cough may be productive, with dogs sometimes bringing up mucus or, in severe cases, blood-tinged material. Increased respiratory rate and effort become noticeable, with affected dogs showing labored breathing even at rest. Some dogs develop wheezing or audible respiratory sounds due to airway inflammation and mucus accumulation. Nasal discharge may also occur as the respiratory system attempts to clear parasitic material and inflammatory debris.

Behavioral changes associated with lungworm infection reflect the systemic nature of this parasitic disease. Affected dogs commonly show decreased appetite and subsequent weight loss as the infection drains their energy reserves and causes general malaise. Lethargy and reduced interest in normal activities frequently accompany respiratory symptoms, with dogs preferring to rest rather than engage in play or exercise. Some dogs exhibit signs of depression or seem generally unwell without owners being able to identify a specific cause. Changes in drinking habits may occur, and some dogs show reluctance to lie flat due to respiratory discomfort, preferring to rest in positions that facilitate easier breathing.

Physical examination findings in dogs with lungworm infection vary based on disease severity and specific parasite species involved. Veterinarians may detect abnormal lung sounds such as crackles, wheezes, or decreased breath sounds in affected areas during auscultation. Increased respiratory effort may be visible, with dogs showing exaggerated chest wall movement or abdominal breathing. In cases involving Angiostrongylus vasorum, signs of bleeding disorder may be present, including pale gums, petechiae or bruising on the skin and gums, prolonged bleeding from minor wounds, or blood in urine or feces. Some dogs develop enlarged lymph nodes as part of the immune response to infection.

Symptom progression in untreated lungworm cases can lead to serious and potentially life-threatening complications. Respiratory distress may become severe, with dogs showing cyanosis of the gums and tongue due to inadequate oxygenation. The coagulopathy associated with Angiostrongylus vasorum can progress to spontaneous bleeding episodes, including hemorrhage into body cavities, the brain, or spinal cord. Neurological signs such as seizures, blindness, or paralysis may develop in cases with central nervous system involvement. Dogs may collapse during exertion or even at rest as cardiovascular and respiratory function becomes critically compromised.

Emergency symptoms requiring immediate veterinary care include severe respiratory distress characterized by open-mouth breathing, extreme anxiety, or blue-tinged gums indicating oxygen deprivation. Any signs of spontaneous bleeding, including bloody vomit, bloody diarrhea, excessive bruising, or prolonged bleeding from wounds, demand urgent attention. Collapse, loss of consciousness, or acute neurological signs such as sudden blindness, seizures, or inability to walk represent medical emergencies. Dogs showing combinations of respiratory and bleeding symptoms should be considered critical, as the coagulopathy associated with certain lungworm species can progress rapidly and prove fatal without immediate intervention.

The initial veterinary examination for suspected lungworm infection begins with a comprehensive history and physical assessment. Veterinarians will inquire about the dog's lifestyle, including outdoor access, exposure to snails or slugs, and any contact with wildlife or areas frequented by foxes. Geographic location and recent travel history are relevant given the regional variation in lungworm prevalence. Physical examination focuses on respiratory assessment, including careful auscultation of the lungs for abnormal sounds, evaluation of breathing pattern and effort, and examination of mucous membrane color. Signs of bleeding abnormalities are also investigated, including examination of the gums for petechiae and assessment of any recent wounds for appropriate clotting.

Diagnostic testing for lungworm typically involves multiple approaches to achieve accurate identification. Fecal examination using the Baermann technique is commonly employed to detect first-stage larvae shed in the feces. This method involves placing fresh fecal material in water to encourage larvae to migrate out of the sample where they can be collected and identified microscopically. However, fecal tests have limitations as larvae are not shed continuously, potentially leading to false-negative results in some infected dogs. Blood tests including complete blood count may reveal anemia, elevated eosinophil counts, or abnormalities in clotting parameters that support a diagnosis of lungworm infection.

Advanced diagnostic imaging and specialized testing provide additional diagnostic information. Chest radiographs frequently show characteristic changes in lungworm-affected dogs, including patchy interstitial or alveolar patterns, bronchial wall thickening, and in some cases, visible nodules. These findings help assess disease severity and guide treatment decisions. Antigen detection tests have become available for Angiostrongylus vasorum, offering rapid in-clinic results and good sensitivity for detecting current infections. These tests detect circulating antigens released by adult worms and can identify infection even when fecal tests are negative. Bronchoalveolar lavage may be performed in some cases to collect respiratory secretions for microscopic examination.

Differential diagnosis is essential because lungworm symptoms overlap with numerous other respiratory conditions. Infectious causes such as kennel cough, bacterial pneumonia, and fungal infections must be considered. Heart disease, particularly in older dogs, can produce similar respiratory symptoms and may coexist with lungworm infection. Allergic airway disease, foreign body aspiration, and lung tumors may also present with coughing and respiratory distress. The diagnostic workup aims to either confirm lungworm infection or identify alternative causes, and in some cases, empirical treatment may be initiated based on clinical suspicion while awaiting definitive test results, particularly in high-prevalence areas where the index of suspicion is elevated.

Emergency treatment for severe lungworm cases prioritizes stabilization of respiratory and cardiovascular function before addressing the underlying parasitic infection. Dogs presenting in respiratory distress require immediate oxygen supplementation, often administered through oxygen cages, nasal cannulas, or flow-by methods depending on patient tolerance and equipment availability. Intravenous fluid therapy helps maintain blood pressure and tissue perfusion, particularly important in dogs showing signs of shock or dehydration. For dogs with severe bleeding complications from Angiostrongylus vasorum infection, blood transfusions may be necessary to replace lost blood volume and provide clotting factors. Anti-inflammatory medications, typically corticosteroids, are often administered to reduce pulmonary inflammation and improve breathing.

Medical management of lungworm infection centers on antiparasitic medications that effectively eliminate both adult worms and larvae. Several anthelmintic drugs have demonstrated efficacy against lungworms, including fenbendazole, which is typically administered daily for an extended period ranging from five to twenty-one days depending on the protocol used and lungworm species involved. Milbemycin and moxidectin are macrocyclic lactone antiparasitics that have proven effective, often as single or repeated doses. The specific treatment protocol selected depends on the lungworm species identified, infection severity, and the dog's overall health status. Treatment response is generally monitored through symptom improvement and follow-up diagnostic testing.

Surgical intervention is rarely required for lungworm infection, as the condition responds well to medical treatment in most cases. However, complications arising from lungworm disease occasionally necessitate surgical management. Dogs that develop secondary bacterial pneumonia with abscess formation may require drainage procedures. In cases where severe bleeding has occurred into body cavities, surgical exploration may be necessary. Nodules caused by Oslerus osleri at the tracheal bifurcation can sometimes cause significant airway obstruction requiring removal, though this is uncommon. Generally, the focus remains on medical management with supportive care rather than surgical approaches.

Supportive care measures are integral to successful lungworm treatment outcomes. Rest is essential during the treatment period, with exercise restriction allowing the respiratory system to heal without additional stress. Nutritional support ensures dogs maintain adequate caloric intake during recovery, with appetite stimulants or assisted feeding provided if necessary. Environmental management reduces continued exposure risk during treatment, with recommendations to limit access to areas where snails and slugs are prevalent. Owners may be advised to remove standing water sources, avoid walks during wet conditions, and keep grass short to reduce gastropod habitat in the immediate environment.

Complementary approaches to lungworm treatment focus on supporting respiratory function and overall recovery. Nebulization therapy may help loosen respiratory secretions and improve airway clearance in dogs with significant mucus accumulation. Coupage, a technique involving gentle percussion of the chest wall, can assist in mobilizing secretions when performed correctly. Some veterinarians recommend nutritional supplements to support immune function during recovery, though these do not replace appropriate antiparasitic treatment. Physical rehabilitation is generally unnecessary for lungworm cases, with dogs typically returning to normal activity levels as infection clears and lung tissue heals.

Treatment decisions are influenced by multiple factors including infection severity, presence of complications, and individual patient considerations. Mild cases may be managed on an outpatient basis with oral antiparasitic medication and follow-up monitoring. Severe cases, particularly those involving respiratory distress or bleeding complications, require hospitalization for intensive supportive care. Cost considerations are relevant as treatment for complicated cases can become expensive, though early detection and treatment typically results in straightforward, affordable management. Prognosis with appropriate treatment is generally excellent for uncomplicated cases, though dogs with severe complications may have a more guarded outcome. Regular communication between veterinary staff and owners regarding treatment response helps ensure optimal outcomes.

The recovery timeline for dogs with lungworm infection varies considerably based on initial disease severity, promptness of treatment initiation, and presence of complications. Dogs with mild to moderate infections typically show improvement within the first week of antiparasitic treatment, with coughing frequency decreasing and energy levels improving. Complete resolution of respiratory symptoms generally occurs over two to four weeks, though some dogs may have residual cough for a longer period as lung tissue heals. Dogs that presented with severe respiratory compromise or bleeding complications face longer recovery periods, potentially requiring several weeks to months before returning to normal function. Follow-up testing, typically performed four weeks after treatment completion, confirms successful parasite elimination.

Post-treatment care requirements focus on supporting respiratory recovery while preventing reinfection. Exercise restriction is commonly recommended during the initial recovery period, typically lasting two to three weeks depending on disease severity, to avoid stressing the healing respiratory system. Owners should monitor breathing rate and effort, reporting any worsening of symptoms promptly to their veterinarian. Medication compliance remains important, with antiparasitic courses needing completion even after symptoms improve. Environmental management during recovery includes limiting access to high-risk areas and avoiding walks during prime gastropod activity times such as early morning, evening, and after rain.

Prognostic factors influencing outcome include the specific lungworm species involved, duration of infection before treatment, and development of complications. Infections caught early and treated promptly carry an excellent prognosis, with most dogs making full recoveries without long-term effects. The presence of coagulopathy, particularly with Angiostrongylus vasorum infection, indicates a more serious disease course and carries increased mortality risk even with intensive treatment. Dogs that develop neurological complications from bleeding into the central nervous system may have permanent deficits. Age and concurrent health conditions also influence prognosis, with younger, otherwise healthy dogs typically recovering more readily than elderly or immunocompromised individuals.

Long-term outlook for dogs that recover from lungworm infection is generally positive. Unlike some parasitic infections that cause permanent organ damage, the lungs typically heal well following successful treatment, especially in cases without severe initial pathology. Most dogs return to their previous activity levels and show no lasting respiratory compromise. However, recovery does not confer immunity, and dogs remain susceptible to reinfection if exposed to parasitic larvae again. This makes ongoing prevention crucial for dogs in endemic areas or those with high-risk lifestyles. Regular monitoring and preventive protocols become part of long-term health management for dogs that have experienced lungworm infection.

Primary prevention of lungworm infection centers on reducing exposure to infected intermediate hosts and implementing regular antiparasitic protocols. Preventive medications that are effective against lungworm are available and recommended for dogs in endemic areas or those with high-risk lifestyles. Monthly treatments containing milbemycin or moxidectin provide protection against Angiostrongylus vasorum and other lungworm species when administered consistently. These preventives work by killing larvae before they can mature into disease-causing adults, making regular administration essential for effective protection. Veterinarians can advise on appropriate preventive products based on regional lungworm prevalence and individual risk assessment.

Environmental management plays a significant role in reducing lungworm transmission risk. Keeping grass short in yards and gardens reduces habitat suitable for snails and slugs. Removing potential hiding places for gastropods, such as plant pots, garden debris, and dense groundcover near areas where dogs spend time, decreases the likelihood of contact. Avoiding leaving toys and water bowls outside overnight, when snail and slug activity is highest, helps prevent contamination. Some owners in high-prevalence areas apply molluscicides to their gardens, though care must be taken to use pet-safe products and prevent dogs from accessing treated areas until safe to do so.

Nutritional factors do not directly prevent lungworm infection but maintaining overall health supports immune function that may influence disease severity if infection occurs. Ensuring dogs receive balanced, complete nutrition appropriate for their life stage and activity level keeps their immune systems functioning optimally. Maintaining healthy body weight reduces respiratory compromise if infection develops. Some owners provide immune-supporting supplements, though these should not be considered substitutes for appropriate preventive medication. Avoiding consumption of raw gastropods is the most important dietary consideration, which relates more to management and training than nutrition specifically.

Routine veterinary care provides opportunities for lungworm prevention and early detection. Regular wellness examinations allow veterinarians to assess risk factors and recommend appropriate preventive protocols. Fecal examinations, while not always detecting lungworm due to intermittent shedding, may identify infection before symptoms develop. Discussion of lifestyle factors during veterinary visits helps ensure prevention recommendations remain appropriate as circumstances change, such as moving to a new area or changes in the dog's outdoor access. Veterinarians can also provide current information about regional lungworm prevalence, which may change over time.

Early intervention strategies emphasize prompt veterinary attention for dogs showing potential lungworm symptoms. Owner education about early warning signs, particularly in endemic areas, enables recognition of subtle symptoms that might otherwise be overlooked. Dogs with persistent cough, exercise intolerance, or unexplained weight loss should be evaluated rather than having symptoms attributed to minor causes. For dogs in high-risk categories, some veterinarians recommend periodic screening even in the absence of symptoms. Rapid diagnostic tests for Angiostrongylus vasorum antigen can provide quick results and enable treatment before severe disease develops. The combination of preventive medication, environmental management, and vigilant monitoring provides comprehensive protection against lungworm infection.

Daily management for dogs recovering from or living with lungworm infection requires attention to several key areas. Medication administration must be consistent, with antiparasitic treatments given exactly as prescribed to ensure complete parasite elimination. Owners should monitor breathing rate and effort daily, establishing a baseline for normal respiratory function and noting any changes. Activity levels should be adjusted based on the dog's current respiratory status, with rest periods provided as needed during recovery. Feeding schedules may need adjustment if appetite is affected, with smaller, more frequent meals sometimes better tolerated than standard meal portions. Documentation of symptoms, medication administration, and any concerns provides valuable information for veterinary follow-up appointments.

Home environment modifications help support dogs during lungworm recovery and reduce reinfection risk. Indoor areas should provide comfortable, clean resting spaces where dogs can recover without stress. Air quality considerations become relevant, with avoidance of cigarette smoke, strong chemical odors, and excessive dust recommended for dogs with compromised respiratory function. Outdoor access should be supervised during recovery, with prevention measures implemented to reduce gastropod exposure. Areas where the dog spends time should be kept clear of debris that might harbor snails and slugs. Water bowls should be kept indoors or frequently cleaned and refreshed if left outside. Some owners choose to create designated toileting areas that can be more easily monitored and managed.

Maintaining quality of life during and after lungworm treatment involves balancing recovery needs with the dog's emotional and mental wellbeing. While exercise restriction is often necessary initially, mental stimulation through puzzle feeders, gentle training sessions, and calm interaction helps prevent boredom and stress. As recovery progresses and respiratory function improves, gradual return to normal activities can occur under veterinary guidance. Social interaction with family members supports emotional health, though contact with other dogs may need management during active infection to prevent environmental contamination. Recognizing signs of respiratory discomfort and providing rest periods helps dogs remain comfortable during recovery.

Ongoing monitoring extends beyond the initial recovery period for dogs that have experienced lungworm infection. Owners should remain vigilant for any recurrence of respiratory symptoms, which could indicate reinfection or incomplete treatment. Regular veterinary check-ups allow professional assessment of respiratory status and discussion of any concerns. Follow-up diagnostic testing may be recommended to confirm successful treatment and provide baseline information for comparison if future issues arise. Preventive medication should be continued consistently, with owners understanding that successful treatment does not prevent future infections if exposure occurs again.

Caregiver support recognizes the challenges owners face when managing a dog with lungworm infection or during recovery. The emotional stress of seeing a pet unwell, combined with practical demands of medication administration, monitoring, and veterinary appointments, can be significant. Financial considerations may affect treatment decisions, and veterinary staff can help discuss options and potentially arrange payment plans for expensive treatments. Online communities and breed clubs may offer support and shared experiences, though medical advice should always come from veterinary professionals. Taking care of one's own wellbeing enables better care for affected pets, with owners encouraged to ask for help and communicate openly with their veterinary team about challenges and concerns.

Lungworm infection can affect any dog regardless of breed, with lifestyle and environmental factors being more significant risk determinants than genetic predisposition. However, certain breed types may face elevated exposure risk based on typical behavioral characteristics and common uses. Hunting breeds and those bred for outdoor work, including Spaniels, Pointers, Setters, and Retrievers, often have increased environmental exposure through their activities in fields, woods, and water sources where gastropods are prevalent. Terriers, bred for pest control and characterized by investigative, digging behavior, may encounter snails and slugs more frequently than less exploratory breeds. Hounds that follow scent trails with noses close to the ground face increased likelihood of inadvertently ingesting gastropods or contaminated material.

Beyond breed-based activity tendencies, individual dog characteristics influence lungworm risk. Dogs that eat grass frequently, regardless of breed, have increased exposure opportunity as slugs and snails or their slime trails may be present on vegetation. Young dogs and puppies, naturally curious and prone to mouthing objects, face higher risk during their exploratory phase. Dogs with strong prey drive may pursue and consume slugs, snails, or frogs that can serve as paratenic hosts. Conversely, dogs with primarily indoor lifestyles and limited outdoor access, regardless of breed, have significantly reduced exposure risk. Dogs in urban environments with less wildlife and gastropod populations may also face lower risk than rural counterparts.

Screening recommendations for lungworm focus less on breed and more on individual risk assessment and geographic location. Dogs in areas with confirmed lungworm presence should be considered for preventive treatment regardless of breed. Annual or more frequent fecal examinations may be recommended for high-risk individuals. The advent of rapid antigen testing for Angiostrongylus vasorum has made screening more accessible, with some veterinarians recommending testing as part of routine wellness care in endemic areas. Owners acquiring puppies or dogs from regions with known lungworm populations should discuss screening with their veterinarian. Breeders in affected areas may consider testing breeding dogs, though lungworm is not a hereditary condition and negative status in parents does not prevent offspring from acquiring infection through environmental exposure.

Several conditions commonly co-occur with or develop as complications of lungworm infection. Secondary bacterial pneumonia may develop when the parasitic damage to respiratory tissues creates conditions favorable for bacterial colonization. Dogs with lungworm-induced coagulopathy from Angiostrongylus vasorum infection may experience bleeding complications affecting various organ systems beyond the respiratory tract. Right-sided heart enlargement can occur with chronic, heavy Angiostrongylus vasorum infection due to the presence of worms in the pulmonary arteries creating increased resistance to blood flow. Anemia frequently accompanies lungworm infection, resulting from both chronic disease and acute blood loss in cases with bleeding complications.

Numerous conditions present with symptoms similar to lungworm infection and must be differentiated through appropriate diagnostic testing. Kennel cough and other infectious tracheobronchitis causes produce coughing that may be indistinguishable from lungworm symptoms without further investigation. Cardiac disease, particularly in older dogs, causes coughing and exercise intolerance similar to respiratory parasitism. Allergic bronchitis and canine asthma create airway inflammation and coughing. Aspiration pneumonia, foreign body inhalation, and lung tumors also enter the differential diagnosis for dogs presenting with persistent cough. The key distinguishing features often rely on diagnostic test results, response to treatment, and consideration of epidemiological factors such as geographic location and lifestyle.

Complications of lungworm infection represent the most serious related conditions. Pulmonary hemorrhage can occur when parasites damage blood vessels within the lungs. Bleeding into the brain or spinal cord causes acute neurological emergencies in some dogs with Angiostrongylus vasorum coagulopathy. Pleural effusion, the accumulation of fluid around the lungs, may develop in severe cases and compromises breathing. Disseminated intravascular coagulation, a life-threatening clotting disorder, represents the most severe manifestation of Angiostrongylus vasorum-associated coagulopathy. Prevention of these complications relies on early detection and treatment of lungworm infection before severe pathology develops, emphasizing the importance of prompt veterinary attention for dogs showing potential symptoms.