Lyme Disease in Dogs: Tick Exposure, Testing and Prevention
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By Dr Duncan Houston
Lyme disease is a tick-borne bacterial illness recognised in some parts of the world. For dog owners, the key questions are where exposure occurred, whether the dog is actually unwell and what a test result means. A tick bite does not automatically mean Lyme disease.
Quick Answer
Dogs acquire Lyme infection through bites from infected ticks, and many infected dogs never develop symptoms. Illness can include fever, painful joints and lameness; a serious kidney disorder is an uncommon associated complication. Diagnosis combines exposure history, examination and testing, while prevention relies on effective tick control and, where appropriate, vaccination.
Location and travel matter
Lyme borreliosis is associated with bacteria in the Borrelia burgdorferi group and suitable tick vectors. Risk varies within North America, Europe and parts of Asia, so ask about the specific destination rather than assuming a whole country carries equal risk.
Current Australian public health guidance reports no evidence that Lyme disease is caused by Australian ticks. That does not make Australian ticks harmless: tick paralysis and other tick-associated illnesses remain important concerns. Tell your veterinarian about overseas travel or importation, including where and when your dog lived.
Signs and other possible explanations
| Finding | How it fits | Other issues to consider |
|---|---|---|
| Fever, tiredness and reduced appetite | Can occur with clinical Lyme disease | Many infections and inflammatory illnesses cause the same signs |
| Painful joints or lameness that changes legs | A recognised presentation in affected dogs | Injury, immune-mediated joint disease and other tick-borne infections |
| Vomiting, weight loss, swelling or changes in drinking | May prompt investigation for kidney disease | Kidney disease has many causes and needs its own assessment |
| Positive antibody test without illness | Usually indicates exposure rather than proving clinical disease | Test type, timing, vaccination history and other findings affect interpretation |
Signs may appear well after exposure, and owners often never saw the tick. Do not wait for a human-style bull's-eye rash; that is not a reliable way to recognise Lyme disease in dogs.
How testing guides care
Your veterinarian may recommend an antibody test based on local risk, travel or symptoms. Testing immediately after a bite can be too early to detect an antibody response. A positive result does not establish that Lyme infection explains every symptom, and a dog can have another tick-borne infection at the same time.
Urine testing is particularly useful to check for abnormal protein loss. Blood tests and further kidney assessment may be recommended if abnormalities are found. The rare condition often called Lyme nephritis is serious, but a positive Lyme test does not by itself prove the cause of kidney disease.
Treatment and follow-up
Dogs with compatible illness may receive a veterinarian-prescribed antibiotic such as doxycycline, commonly over several weeks. Dogs with kidney complications require a broader treatment and monitoring plan. Improvement does not guarantee that infection has been eliminated or that reinfection cannot occur.
Antibiotics are not automatically needed after every tick bite or every positive screening test. Your veterinarian will consider symptoms, urine results, other tests and the individual risks. Give prescribed medication as directed and attend follow-up checks rather than stopping when your dog seems brighter.
When to seek urgent help
Arrange prompt assessment for fever, painful lameness, marked lethargy or poor appetite after tick exposure. Repeated vomiting, significant weakness or changes in drinking and urination also need timely care. Collapse, breathing difficulty, seizures or progressive weakness are emergencies regardless of whether Lyme disease is possible. In Australia, weakness or breathing changes after a tick bite may indicate tick paralysis and must not wait for Lyme testing.
A practical prevention plan
- Choose a veterinary-recommended tick product suitable for your dog's age, weight, health and local tick species, and follow its dosing interval.
- Check the coat and skin regularly, including around ears, the neck, feet and skin folds, even when prevention is used.
- Remove attached ticks promptly with an appropriate tick-removal tool or obtain veterinary help. Do not burn them or apply irritants.
- Reduce exposure to tick habitat where practical and discuss destination-specific protection before travel.
- Ask about Lyme vaccination if your dog lives in or visits an endemic region. Vaccination supplements tick control rather than replacing it.
Frequently Asked Questions
Can I catch Lyme disease directly from my dog?
Ordinary contact with an infected dog is not the usual transmission route. The shared concern is exposure to infected ticks, including ticks carried into the home.
Does a normal dog with a positive test need monitoring?
Yes. Your veterinarian may recommend urine checks and other follow-up while reviewing tick prevention. A healthy appearance does not answer every kidney-health question.
Can a dog get infected again?
Yes. Previous exposure or treatment does not remove the need for ongoing protection.
Sources and Further Reading
- Cornell: Lyme disease in dogs
- CAPC: Lyme disease guidelines
- Merck Veterinary Manual: Canine Lyme disease
- NSW Health: Lyme disease and Australian context
A clear travel history, sensible testing and consistent tick prevention make risk easier to manage. New illness still deserves assessment rather than an assumption about which tick-borne condition is responsible.
ASK A VET™ can help you understand a Lyme test result and prepare questions about prevention or follow-up. Breathing difficulty, collapse or progressive weakness needs immediate in-person veterinary care.
