Mastitis in Rabbits
- Mastitis in rabbits is inflammation or infection of the mammary glands, most often in nursing or recently pseudopregnant female rabbits.
- Common signs include hot, swollen, painful mammary tissue, red or bluish skin, discharge from a teat, reduced appetite, lethargy, and sick or fading kits.
- See your vet promptly if you notice mammary swelling, pain, discharge, fever, or your rabbit stops eating. Rabbits can decline quickly when pain and infection are involved.
- Treatment may include an exam, pain relief, rabbit-safe antibiotics chosen by your vet, supportive care, and sometimes drainage or surgery for abscessed or recurring disease.
What Is Mastitis in Rabbits?
Mastitis is inflammation of one or more mammary glands. In rabbits, it is usually linked to bacterial infection of the milk-producing tissue, especially during lactation, after kindling, or during pseudopregnancy. Some rabbits develop a sudden painful infection, while others may have more chronic gland changes such as cysts or abscesses.
Pet parents may hear the term "blue breast" in rabbits. That nickname is used for severe mastitis when affected mammary tissue becomes very swollen, congested, and can look dark red, purple, or bluish. This form can be serious for both the mother rabbit and her kits.
Mastitis is not something to monitor at home for long. Pain can reduce eating, and rabbits that stop eating are at risk for dangerous gut slowdown. Early veterinary care often gives the best chance of controlling infection, protecting the remaining glands, and helping the rabbit stay comfortable.
Symptoms of Mastitis in Rabbits
- One or more mammary glands that are swollen, firm, warm, or painful
- Red, purple, or bluish discoloration over the gland
- Discharge from a teat, including pus, blood, or abnormal milk
- Reduced appetite, hiding, tooth grinding, or reluctance to be handled
- Lethargy, dehydration, or fever
- Kits that seem weak, hungry, failing to gain weight, or dying suddenly
- A lump, thickened gland, or abscess that does not improve
Mild swelling can become severe quickly, especially in a nursing doe. Contact your vet the same day if a mammary gland looks enlarged, hot, or painful. See your vet immediately if your rabbit stops eating, seems weak, has dark discoloration of the skin, has discharge from the gland, or if the kits are fading. These signs can mean a deeper infection, abscess, or spread beyond the gland.
What Causes Mastitis in Rabbits?
Most rabbit mastitis cases are caused by bacteria entering the mammary gland through the teat opening or through small skin injuries. Staphylococcus aureus is a well-known cause in rabbits, and other bacteria may also be involved. Infection is more likely when a doe is producing milk, because the glands are enlarged and active.
Risk goes up with poor nest or housing hygiene, damp bedding, trauma from nursing kits, scratches, and heavy milk production. Pseudopregnancy can also contribute because a rabbit may develop mammary enlargement and milk production without actually nursing a litter.
Some rabbits develop cystic mammary disease rather than a straightforward infection. In intact female rabbits, mammary changes can also overlap with reproductive hormone problems and, less commonly, mammary tumors. That is one reason your vet may recommend looking at the whole reproductive picture, not only the swollen gland.
How Is Mastitis in Rabbits Diagnosed?
Your vet usually starts with a hands-on exam. They will look for swollen, painful, reddened, or discolored mammary tissue and may check for abnormal discharge, dehydration, fever, and signs that your rabbit is not eating enough. Because rabbits hide illness well, the full-body exam matters.
Diagnosis may also include cytology or culture of discharge, bloodwork, and sometimes imaging such as ultrasound or radiographs if an abscess, deeper tissue involvement, or another reproductive problem is suspected. Culture can be especially helpful when infection is severe, recurring, or not responding as expected, because rabbits need carefully selected antibiotics.
Your vet may also assess the kits if the doe is nursing. Sick kits can be an early clue that milk production is affected or that the mother is too painful to nurse normally. In intact females with recurrent mammary problems, your vet may discuss whether spaying and additional reproductive evaluation make sense.
Treatment Options for Mastitis in Rabbits
Spectrum of Care means you have options. Here are treatment tiers at different price points.
Budget-Conscious Care
- Office or urgent exam with mammary gland assessment
- Rabbit-safe pain control prescribed by your vet
- Empiric oral antibiotic when your vet feels infection is likely
- Home supportive care instructions, including hydration and assisted feeding guidance if needed
- Recheck visit if swelling is improving and your rabbit stays stable
Recommended Standard Treatment
- Comprehensive exotic-pet exam
- Pain relief plus targeted supportive care
- Cytology and/or bacterial culture when discharge is available
- Bloodwork to check for systemic illness or dehydration
- Fluid support, syringe-feeding plan, and nursing management guidance
- Follow-up exam to confirm the gland is shrinking and appetite is normalizing
Advanced / Critical Care
- Hospitalization for rabbits that are not eating, dehydrated, or systemically ill
- Advanced imaging or repeated monitoring
- Injectable medications, fluid therapy, and assisted feeding
- Sedation or anesthesia for wound care, abscess treatment, or sampling
- Surgery for severe abscessed, necrotic, chronic, or recurring mammary disease; may include spay if your vet recommends it
- Intensive follow-up and neonatal support planning if kits are involved
Cost estimates as of 2026-03. Actual costs vary by location, clinic, and individual case.
Questions to Ask Your Vet About Mastitis in Rabbits
Bring these questions to your vet appointment to get the most out of your visit.
- You can ask your vet whether this looks like simple mastitis, an abscess, cystic mammary disease, or another mammary problem.
- You can ask your vet if a culture or cytology would help choose the safest and most effective antibiotic for your rabbit.
- You can ask your vet how to tell whether your rabbit is painful, dehydrated, or starting to develop GI stasis at home.
- You can ask your vet whether the kits should keep nursing, need supplementation, or should be separated.
- You can ask your vet what warning signs mean the infection may be spreading or the gland is becoming necrotic.
- You can ask your vet whether imaging is recommended to look for deeper infection or reproductive disease.
- You can ask your vet if spaying should be part of the long-term plan, especially for recurrent mastitis or pseudopregnancy.
- You can ask your vet when to schedule a recheck and what improvement should look like over the next few days.
How to Prevent Mastitis in Rabbits
Good prevention starts with clean housing and careful breeding management. Keep nesting areas dry, remove soiled bedding promptly, and check nursing does daily for mammary swelling, skin injury, or changes in appetite. Early detection matters because rabbits often hide pain until they are quite uncomfortable.
Try to reduce trauma to the mammary glands. Sharp cage surfaces, rough flooring, and overgrown nails in kits can all contribute to skin damage. If a doe is nursing, make sure the nest stays clean and that the kits are latching normally rather than repeatedly traumatizing one area.
For pet rabbits not intended for breeding, talk with your vet about spaying. Spaying can reduce hormone-driven reproductive problems such as pseudopregnancy and also lowers the risk of several reproductive and mammary diseases in intact female rabbits. If your rabbit has had mastitis before, ask your vet what monitoring plan makes sense for future litters or whether breeding should be avoided.