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Some bacterial infections can remain unnoticed in dogs for long periods, making early detection difficult. Even a healthy-looking dog may carry an infection that affects its reproductive health and potentially exposes other animals or people.
Brucellosis in dogs is a contagious bacterial disease most commonly associated with Brucella canis. It can cause reproductive problems, infertility, and pregnancy loss. Because this infection can also affect humans, pet owners should understand how it spreads.
What Causes Brucellosis in Dogs?
The infection develops when dogs are exposed to Brucella bacteria, particularly Brucella canis.
Transmission commonly occurs through contact with infected reproductive fluids, semen, vaginal discharge, or materials associated with pregnancy and birth.
Dogs may become infected through:
- Mating with an infected dog
- Contact with infected reproductive fluids
- Exposure to contaminated birthing materials
- Contact with infected urine or other bodily fluids
Breeding kennels and environments where dogs have close reproductive contact may face a higher risk.
Symptoms of Brucellosis in Dogs
Symptoms can vary, and some infected dogs show no obvious signs of illness.
Possible warning signs include:
- Difficulty conceiving or infertility
- Miscarriage or stillbirth
- Swollen or painful testicles
- Reduced breeding performance
- Enlarged lymph nodes
- Back pain or difficulty walking.
- Unusual tiredness
In some cases, the infection may spread to the spine, causing ongoing back pain, stiffness, or difficulty moving comfortably.
Can Dogs Carry Brucellosis Without Symptoms?
Yes. Dogs infected with Brucella canis may appear healthy while still carrying the bacteria.
This makes brucellosis in dogs particularly concerning in breeding environments, where infected animals may spread the disease before anyone recognizes a problem.
Veterinary testing is important when a dog has a history of reproductive difficulties or possible exposure.
How Is Brucellosis Diagnosed?
A veterinarian may recommend blood tests that detect antibodies against Brucella bacteria.
Additional tests, such as PCR or bacterial culture, may be needed to investigate suspected infections.
Because testing can sometimes yield uncertain results, a veterinarian may recommend repeat or confirmatory testing.
Treatment for Brucellosis in Dogs
Treating canine brucellosis can be challenging because the bacteria may persist despite antibiotic therapy.
A veterinarian may consider prolonged antibiotic treatment in selected cases, but treatment does not reliably eliminate the infection, and relapses can occur.
Do not breed infected dogs. Neutering may reduce reproductive shedding but does not guarantee that the bacteria have been eliminated.
Your veterinarian can explain management options, long-term precautions, and any local reporting requirements.
Can Humans Catch Brucellosis From Dogs?
Yes. Brucellosis in dogs is a zoonotic infection, meaning it can be transmitted to humans.
Human infections with Brucella canis are uncommon but can occur, particularly after exposure to infected reproductive fluids, blood, or contaminated materials.
Possible symptoms in people include fever, fatigue, headaches, muscle aches, and joint pain.
Anyone who suspects exposure should contact a healthcare professional and explain the possible contact with Brucella canis.
How Can You Prevent Brucellosis in Dogs?
Prevention focuses on limiting exposure and identifying infected animals.
Important precautions include:
- Testing breeding dogs before mating
- Avoiding breeding dogs with unknown infection status
- Following veterinary advice when introducing dogs into breeding facilities
- Using protective gloves when handling potentially infectious reproductive materials
- Cleaning and disinfecting contaminated areas appropriately
- Seeking veterinary testing after suspected exposure
No commercially available vaccine currently exists for canine brucellosis.
Supporting Your Dog’s Preventive Health
Regular veterinary exams, appropriate parasite prevention, and good hygiene all support responsible dog care.
At 79Pets, pet owners can explore flea, tick, worm, and other parasite-control products to support their dog’s routine preventive care.
Important: Dewormers and flea or tick treatments do not prevent or cure brucellosis. Suspected infections require professional veterinary assessment.
When Should You Contact a Veterinarian?
Arrange veterinary care if your dog experiences unexplained reproductive problems, pregnancy loss, swollen testicles, persistent back pain, or suspected exposure to an infected dog.
Tell the clinic about possible brucellosis before your visit so staff can take appropriate precautions.
Final Thoughts
Brucellosis in dogs is a contagious bacterial disease that can cause reproductive complications and, in some instances, be transmitted from infected dogs to people.
Although infected dogs may not always appear sick, responsible breeding practices, appropriate testing, good hygiene, and veterinary guidance can help reduce transmission and protect both animals and people.
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- Can Dogs Carry Infectious Diseases Without Showing Symptoms?
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- How Long Is a Dog Contagious After an Infectious Disease?
