Endometritis

Endometritis is an inflammatory condition affecting the endometrium, the innermost lining of the uterus, in female rabbits. This inflammation is typically caused by bacterial infection that ascends into the uterine cavity, leading to tissue inflammation, discharge, and potentially serious systemic illness if untreated. Endometritis represents an important component of the spectrum of uterine diseases affecting intact female rabbits and can occur in both breeding does and those that have never been bred.

The condition develops when bacteria colonize the normally sterile uterine environment. The most common causative organisms include Pasteurella multocida, which causes widespread disease in rabbits, along with Staphylococcus species, Streptococcus species, and various other bacteria. These organisms may enter the uterus through the vagina during breeding, after kindling, or by ascending spontaneously through the cervix. Pre-existing uterine pathology such as endometrial hyperplasia creates a favorable environment for bacterial colonization, making older intact does particularly vulnerable.

Endometritis significantly impacts the health of affected rabbits, causing discomfort, systemic illness, and reproductive failure. Does with active endometritis may show vaginal discharge, decreased appetite, lethargy, and behavioral changes indicating they do not feel well. The infection can impair fertility in breeding does and, if it progresses to pyometra (accumulation of pus in the uterus), can become life-threatening. Because rabbits hide illness as prey animals, early signs may be subtle, and the condition can advance considerably before obvious symptoms alert owners to a problem.

Treatment typically involves surgical removal of the infected uterus along with antibiotic therapy to address the bacterial component. Medical management with antibiotics alone is generally not curative because the infection source remains within the uterus. Prognosis with prompt surgical treatment is good in most cases, though outcomes depend on the severity of infection and whether sepsis has developed. Prevention through early spaying eliminates the risk of endometritis along with other uterine pathology, making it the recommended approach for female rabbits not intended for breeding.

The primary cause of endometritis is bacterial infection of the uterine lining. Multiple bacterial species can be responsible, with Pasteurella multocida being one of the most common pathogens involved in rabbit reproductive tract infections. Other causative organisms include Staphylococcus aureus, various Streptococcus species, Escherichia coli, Pseudomonas aeruginosa, and various anaerobic bacteria. Often, mixed bacterial populations are present, with multiple species contributing to the infection. The specific organisms involved can influence disease severity and antibiotic selection.

Bacteria gain access to the uterus through several routes. Ascending infection from the vagina through the cervix is the most common pathway, particularly when cervical integrity is compromised or when organisms are introduced during breeding. Post-kindling infection can occur when bacteria enter through the dilated cervix during and after delivery. Unsanitary breeding practices or contaminated environments increase infection risk. In some cases, bacteria may spread to the uterus through the bloodstream from other infection sites in the body. Does carrying Pasteurella in their nasal passages or other sites may experience spread to the reproductive tract.

Underlying uterine pathology significantly increases susceptibility to endometritis. Endometrial hyperplasia creates an abnormal tissue environment that promotes bacterial colonization. Cystic changes in the endometrium provide protected spaces where bacteria can establish infection. Compromised blood flow to abnormal tissue reduces local immune defenses. Prior uterine disease, previous infections, and any condition disrupting normal uterine architecture create vulnerability. This explains why endometritis often occurs as a complication superimposed on other uterine pathology rather than in isolation.

Age and reproductive history influence endometritis risk. Older intact does have both increased uterine pathology creating susceptibility and longer cumulative exposure to potential infection. Breeding does face repeated opportunities for bacterial introduction with each mating. Does with a history of reproductive complications, retained fetuses, or difficult deliveries are at elevated risk. First-time mothers may be more susceptible to post-kindling infections. Immunocompromised does, whether from stress, concurrent illness, or nutritional deficiencies, have reduced ability to clear bacterial challenges.

The mechanism of disease involves bacterial colonization of the endometrium followed by immune response and inflammation. Bacteria adhere to endometrial cells and begin multiplying, releasing toxins and inflammatory mediators. The immune system responds with recruitment of inflammatory cells, causing tissue swelling, discharge production, and local tissue damage. If infection is contained locally, the result is chronic endometritis with ongoing inflammation and discharge. If bacteria overwhelm local defenses and enter the bloodstream, sepsis and systemic illness develop. Progression to pyometra occurs when pus accumulates in the uterine cavity, potentially leading to uterine rupture and peritonitis.

Early warning signs of endometritis can be subtle, as rabbits instinctively hide illness and the infection may initially cause only mild symptoms. Slight behavioral changes such as reduced activity or less interest in interaction may be the first indication. The doe may seem slightly off without obvious clinical signs. Breeding does may show decreased fertility or fail to conceive despite successful mating. Subtle appetite changes may occur, though these can easily be missed. Changes in litter box habits or slight reduction in fecal pellet production may be present. These early signs are easily overlooked, which is why the condition often advances before detection.

Vaginal discharge is the most characteristic symptom of endometritis. The discharge may range from cloudy mucoid material to frankly purulent (containing pus), and color varies from white or yellow to brownish or blood-tinged. The amount of discharge varies; sometimes it is obvious on bedding and around the vulva, while other times it may only be detected on veterinary examination. The discharge may have an unpleasant odor due to bacterial content. Owners may notice staining on the fur around the genital area. Any vaginal discharge in a rabbit warrants veterinary evaluation, as it is always abnormal and indicates reproductive tract pathology.

Behavioral changes become more apparent as infection progresses. Lethargy develops as the doe does not feel well, with reduced movement and activity. She may seem depressed and uninterested in her environment. Appetite decreases, which is particularly concerning in rabbits because reduced eating can trigger GI stasis. The doe may resist handling, especially around the abdomen. Nesting behavior may change in breeding does, with affected animals showing poor maternal behavior. Social interaction with other rabbits or human family members may decrease. The doe may assume a hunched posture indicating abdominal discomfort.

Physical signs include palpable uterine enlargement in some cases, though this requires veterinary skill to assess. Abdominal discomfort may be evident on gentle palpation. The vulva may appear swollen or inflamed. Discharge may be visible at the vulvar opening. Body temperature may be elevated (fever) or, in advanced cases with sepsis, may be subnormal. Mucous membrane color should be assessed; pale membranes suggest possible anemia while brick-red or muddy membranes suggest sepsis. Weight loss may occur with prolonged illness. Coat condition may deteriorate.

Symptom progression varies depending on the severity of infection and the rabbit's immune response. Mild endometritis may cause chronic, low-grade symptoms over weeks to months. More severe infection progresses more rapidly, with worsening discharge, increasing lethargy, and declining appetite over days. If infection progresses to pyometra with uterine distension, the abdomen may become visibly enlarged. Sepsis development causes rapid deterioration with high fever followed by subnormal temperature, severe lethargy, and collapse. The doe may stop eating and drinking entirely. Without treatment, severe endometritis and pyometra are fatal.

Emergency symptoms requiring immediate veterinary care include sudden collapse, extreme lethargy or unresponsiveness, not eating for more than 12 hours, no fecal output, visible abdominal distension, foul-smelling discharge suggesting pyometra, signs of shock such as cold extremities and pale gums, and open-mouth breathing. Any rabbit with vaginal discharge that becomes acutely ill should be seen emergently. Rapid progression of symptoms over hours suggests severe infection requiring immediate intervention. Do not delay seeking care for an apparently septic rabbit, as these cases deteriorate quickly.

Initial examination for suspected endometritis involves a comprehensive history and physical assessment. The veterinarian will ask about reproductive history, any observed discharge, behavioral changes, and appetite. Physical examination includes assessment of vital signs, mucous membrane color, and hydration status. Careful abdominal palpation evaluates uterine size and character. The vulva and vaginal area are examined for discharge, and any discharge present is characterized. Body condition scoring and overall health assessment provide context. Finding a rabbit-savvy veterinarian is essential as reproductive tract evaluation requires familiarity with normal rabbit anatomy and reproductive physiology.

Diagnostic imaging helps evaluate the reproductive tract and assess infection severity. Abdominal radiographs show uterine size and can reveal enlargement suggestive of pyometra or other pathology. X-rays may also reveal concurrent conditions. Abdominal ultrasound provides more detailed uterine evaluation, allowing assessment of wall thickness, fluid content, and character of any discharge within the uterus. Ultrasound can help distinguish between pyometra, hydrometra, and mucometra. Free fluid in the abdomen might indicate uterine rupture. Imaging findings guide treatment planning and help predict surgical challenges.

Laboratory testing characterizes the infection and assesses systemic impact. Culture and sensitivity testing of vaginal discharge identifies the causative bacteria and determines which antibiotics will be effective. However, vaginal cultures may not perfectly represent uterine flora. A complete blood count may reveal elevated white blood cell count indicating infection, or in severe cases, suppressed counts suggesting overwhelming sepsis. Anemia may be present with chronic infection or blood loss. Chemistry panel evaluates organ function, with particular attention to kidney and liver values if sepsis is suspected. Blood glucose may be abnormal. These results guide supportive care decisions and help predict prognosis.

Definitive diagnosis and characterization occurs through histopathological examination of the surgically removed uterus. Microscopic examination confirms inflammation of the endometrium and may reveal abscessation, tissue necrosis, or concurrent conditions like hyperplasia or neoplasia. Bacterial culture of uterine tissue provides more accurate identification of causative organisms than vaginal samples. Pathology results confirm the diagnosis, characterize severity, and identify any additional uterine pathology that may affect prognosis or require monitoring.

Surgical ovariohysterectomy is the definitive treatment for endometritis, providing complete removal of the infected tissue. Surgery should be performed by a veterinarian experienced with rabbit surgery and comfortable managing infected, potentially friable tissue. Unlike routine spay procedures, surgery on an infected uterus carries increased risk of complications including hemorrhage from inflamed tissue, contamination of the abdomen if uterine contents leak, and anesthetic challenges in systemically ill patients. The reproductive tract in infected does may be enlarged, thickened, and more difficult to handle than healthy tissue. Complete removal of all uterine tissue is essential to resolve the infection.

Preoperative stabilization may be needed for significantly ill patients. Intravenous fluid therapy addresses dehydration and supports circulation in septic patients. Antibiotic therapy should begin before surgery once samples for culture have been collected. Appropriate rabbit-safe antibiotics include enrofloxacin, trimethoprim-sulfa, or chloramphenicol; specific selection may be adjusted based on culture results. Many common antibiotics are fatal to rabbits, including oral amoxicillin, ampicillin, clindamycin, and most oral penicillins, so antibiotic selection requires familiarity with rabbit-safe options. Pain management and gut motility support prepare the patient for surgery.

Postoperative antibiotic therapy continues after surgery to address any remaining bacteria and prevent complications. The duration of antibiotic treatment depends on infection severity and typically ranges from one to four weeks. Selection should be guided by culture and sensitivity results when available. Monitoring for side effects of antibiotics, particularly gastrointestinal disturbance, is important. Probiotics may be helpful alongside antibiotics to support gut flora. If the initial antibiotic selection is not producing clinical improvement, reassessment and potential antibiotic change may be needed.

Supportive care is essential for recovery, particularly in patients that were systemically ill before surgery. Pain management with rabbit-safe medications ensures comfort and encourages eating. Meloxicam is commonly used for pain and inflammation; opioids may be added for additional pain control. Gut motility support with medications like metoclopramide helps prevent post-surgical GI stasis. Syringe feeding with critical care formula should begin if the rabbit does not eat voluntarily within 12 hours. Fluid therapy continues until the rabbit is eating and drinking well. The rabbit should be kept warm and housed in a quiet, stress-free environment.

Medical management without surgery is generally not recommended as primary treatment for endometritis. Antibiotics alone cannot sterilize an infected uterus because the tissue environment protects bacteria and prevents adequate drug penetration. While antibiotics may temporarily suppress infection and improve clinical signs, relapse is expected once treatment stops. Medical management might be considered only for temporary stabilization before surgery, for patients with prohibitive surgical risk from concurrent disease, or in rare cases where owner constraints prevent surgery and palliative management is elected with understanding of poor long-term prognosis.

Factors affecting treatment decisions include the severity of illness, presence of concurrent disease, patient age and overall condition, and practical considerations. Emergency surgery may be needed for acutely ill patients, while more stable patients allow time for culture results to guide antibiotic selection. Older patients may have increased surgical risk but also increased risk of concurrent uterine pathology that makes surgery more important. Cost considerations are valid, and discussing expected costs helps owners make informed decisions. Quality of life assessment guides whether aggressive treatment or palliative care is most appropriate for severely affected patients.

Recovery from surgery for endometritis generally progresses well with appropriate postoperative care, though the timeline depends on how ill the patient was before surgery. Does that were relatively stable before surgery may return to near-normal activity within one to two weeks. Those that were systemically ill with sepsis or significant infection face longer recovery periods, potentially several weeks before full recovery. The immediate postoperative period requires close monitoring, with the first 48 to 72 hours being the most critical for detecting complications.

Postoperative care requirements center on monitoring recovery indicators and ensuring continued eating. Appetite should begin returning within 12 to 24 hours after surgery with adequate pain management. If the rabbit does not eat, syringe feeding must begin promptly. Fecal output should be monitored; any absence of fecal pellets for more than 12 hours postoperatively indicates GI stasis and requires intervention. The incision site should be checked daily for swelling, redness, discharge, or opening. Antibiotics must be given as prescribed, with attention to any signs of gastrointestinal upset that might indicate antibiotic intolerance. Activity should be restricted during initial healing, typically for 10 to 14 days.

Prognosis with appropriate surgical treatment is generally good. Does that had localized endometritis without sepsis have excellent prognosis for full recovery. Those that had sepsis before surgery have more guarded prognosis, though many still recover well. If concurrent uterine pathology such as cancer was found, prognosis depends on the nature and extent of that disease. Histopathology results provide important prognostic information. Most does that survive the immediate postoperative period and begin eating normally go on to make full recoveries.

Long-term outlook after recovery from endometritis is favorable. The reproductive tract has been removed, eliminating the source of infection and preventing recurrence of any reproductive tract disease. Behavior often improves after spaying, with reduced hormonal influences on temperament. Lifespan expectations return to normal once recovery is complete. If sepsis occurred, monitoring for any long-term organ effects may be appropriate. Annual wellness examinations with a rabbit-savvy veterinarian support ongoing health. No specific monitoring for resolved endometritis is needed once recovery is complete and the reproductive tract has been removed.

Primary prevention of endometritis is achieved through spaying female rabbits before uterine disease develops. Ovariohysterectomy between four and six months of age eliminates the uterus before infection can occur. This is the most effective prevention strategy and is recommended for all female pet rabbits not intended for breeding. Early spaying, when the rabbit is young and healthy, carries lower risk than surgery performed later in life or in the face of existing disease. Removing the reproductive tract prevents not only endometritis but the full spectrum of uterine diseases.

For breeding does, management practices reduce endometritis risk during the breeding career. Maintain clean breeding environments with sanitary cages and nest boxes. Ensure breeding bucks are healthy with no signs of infection before mating. Provide clean kindling areas with fresh bedding. Monitor does closely after kindling for any signs of reproductive problems. Address retained placentas or other post-kindling complications promptly. Limit the number of litters and retire does from breeding before advanced age increases susceptibility to reproductive disease. Spay breeding does once their reproductive career is complete.

Dietary support promotes immune function and overall health that helps resist infection. Provide unlimited grass hay as the foundation of the diet, supporting gut health which underlies systemic immune function. Offer appropriate amounts of quality pellets formulated for the rabbit's life stage. Include fresh leafy greens daily for additional nutrition. Avoid obesity through appropriate portions, as excess weight impairs health and immunity. Ensure clean, fresh water is always available. Consistent diet prevents gastrointestinal upset that can compromise overall health.

Health maintenance supports the doe's ability to resist and fight infection. Regular veterinary examinations with a rabbit-savvy veterinarian allow early detection of any health concerns. Minimize stress, which impairs immune function. Maintain appropriate housing temperatures and good ventilation without drafts. Keep the environment clean to reduce bacterial exposure. Quarantine new rabbits before introducing them to existing does. Address any signs of illness promptly to prevent secondary complications. Breeding does should receive prebreeding health assessments.

Early intervention when problems are detected prevents progression to severe disease. Any vaginal discharge should prompt veterinary evaluation rather than watchful waiting. Changes in behavior, appetite, or fecal production in an intact doe warrant examination. Post-kindling monitoring should include watching for discharge, fever, or behavioral changes suggesting infection. Prompt treatment of early endometritis, before sepsis develops, has better outcomes than treating advanced disease. Having an established relationship with a rabbit-savvy veterinarian allows rapid access to care when concerns arise.

Daily management of a doe recovering from endometritis or at risk requires attention to monitoring and medication compliance. Administer prescribed antibiotics exactly as directed, maintaining consistent timing and completing the full course even if the rabbit appears recovered. Monitor appetite daily; any decrease in eating should trigger concern and potentially veterinary contact. Check fecal output for normal size, quantity, and consistency. Observe behavior for signs of improvement or deterioration. Keep medication administration records to track compliance. Ensure the rabbit has access to unlimited hay, appropriate pellets, fresh water, and leafy greens throughout recovery.

The home environment should support healing and minimize stress. House the recovering doe in a quiet area away from household chaos. Maintain comfortable temperatures between 60 and 70°F. Provide soft, clean bedding that is changed regularly to maintain hygiene around the healing surgical site. Restrict activity during the initial healing period by providing a smaller enclosure that allows comfortable movement without jumping or climbing. Non-slip flooring helps prevent injury. The enclosure should be easy to keep clean and allow good observation of the rabbit.

Quality of life assessment guides ongoing care decisions. Good quality of life indicators include normal appetite, interest in surroundings, normal grooming behavior, comfortable posture, and willingness to move about. Poor quality of life signs include persistent appetite suppression, hunched posture, reluctance to move, unkempt coat, and lack of interest in environment or interaction. Most does recovering from successfully treated endometritis show progressive improvement in quality of life over days to weeks. Any decline after initial improvement warrants veterinary reassessment.

Monitoring and ongoing care extend through the recovery period and any subsequent antibiotic course. Track appetite by observing how much hay and pellets are consumed daily. Monitor fecal pellet production, which should return to normal size and quantity as recovery progresses. Watch for any signs of antibiotic side effects including diarrhea or significant decrease in appetite. Check the incision site as directed by the veterinarian. Note any return of discharge, though this should not occur after proper surgical removal of the reproductive tract. Maintain follow-up appointments to confirm healing and adjust treatment if needed.

Caregiver support resources help owners manage treatment and recovery. The House Rabbit Society provides information about rabbit health and can help locate rabbit-savvy veterinarians. Local rabbit rescue organizations often have experience with post-surgical care and can offer practical advice. Online communities dedicated to rabbit care provide peer support from others who have navigated similar situations. Rabbit-savvy veterinary practices are the best source of individualized guidance. Keeping notes on the rabbit's daily status helps track recovery and provides useful information for veterinary consultations. Recovery from endometritis, while requiring dedication during the treatment period, typically results in excellent long-term outcomes.

Endometritis can affect any intact female rabbit regardless of breed, as susceptibility relates primarily to reproductive status and bacterial exposure rather than breed-specific factors. No breed has been identified as having particular predisposition to this infection. Small breeds commonly kept as pets, including Holland Lop, Netherland Dwarf, and Mini Rex, are frequently diagnosed because they represent a large portion of the pet rabbit population. Large breeds such as Flemish Giant and New Zealand are equally susceptible. Mixed breed rabbits face the same risks as purebred animals. Any intact doe can develop endometritis given the right combination of bacterial exposure and susceptibility.

Risk factors beyond breed include age, reproductive history, and underlying uterine health. Older intact does face increased risk because they commonly have concurrent uterine pathology like endometrial hyperplasia that predisposes to infection. Breeding does face repeated bacterial exposure with each mating, though healthy does may clear bacteria without developing disease. Does with a history of reproductive complications have elevated risk. Does in unsanitary conditions or exposed to infected animals face greater bacterial challenge. Immunocompromised does from any cause are more susceptible to infection establishment.

Screening and prevention recommendations apply across all breeds. The universal recommendation for pet female rabbits is spaying between four and six months of age, eliminating endometritis risk along with other reproductive diseases. For breeding does, sanitary management practices and monitoring for reproductive problems reduce risk during the breeding career. Breeding does should be spayed after retirement from reproduction. Older intact does of any breed warrant enhanced monitoring and strong consideration of elective spay to prevent reproductive tract diseases. No breed-specific screening protocols exist because the risk factors are related to individual circumstances rather than genetics.

Pyometra, the accumulation of pus within the uterus, represents the progression of severe or untreated endometritis. As infection worsens and pus production exceeds drainage, the uterus fills with purulent material and becomes distended. Pyometra is more dangerous than uncomplicated endometritis because the large bacterial load increases sepsis risk and the distended uterus may rupture causing peritonitis. The same treatment applies: surgical removal of the infected reproductive tract along with aggressive supportive care. Distinguishing advanced endometritis from pyometra affects prognostic discussions but not fundamental treatment approach.

Other uterine conditions commonly coexist with endometritis. Endometrial hyperplasia creates the altered tissue environment that predisposes to infection and is frequently found in the same uterus. Uterine adenocarcinoma may be present, particularly in older does, and affects prognosis independent of the infectious component. Cystic endometrial changes may accompany hyperplasia. Endometrial venous aneurysms may coexist. Histopathological examination of the surgically removed uterus frequently reveals multiple concurrent pathologies, underscoring why these conditions are considered part of a uterine disease complex in intact female rabbits.

Complications of endometritis include life-threatening sepsis if bacteria enter the bloodstream, with potential for septic shock and multi-organ failure. GI stasis commonly develops secondary to illness and decreased appetite, compounding the medical crisis. Hepatic lipidosis may occur with prolonged anorexia. Peritonitis can develop if the infected uterus ruptures or if contamination occurs during surgery. Adhesions may form following abdominal inflammation. Infertility occurs in breeding does that survive without surgery. These complications emphasize the importance of prompt diagnosis and treatment to prevent progression from localized infection to systemic disease.