By Dial A Vet Veterinary Team
Leptospirosis is caused by Leptospira bacteria that hitchhike in the urine of infected wildlife and some livestock. Dogs drink from puddles, sniff wet soil or swim in slow water, and can fall severely ill with kidney and liver injury. People in the household can also be infected, which is why vets talk about gloves, disinfection and handwashing when this disease is on the table. It is not a theoretical foreign illness. Australian dogs still meet it.
Key takeaways
- Risk rises with access to wildlife urine-contaminated water, farms, floods and rodent-heavy areas.
- Fever, vomiting, reduced urine, jaundice and lethargy are among the warning signs.
- Leptospirosis is zoonotic. Use hygiene while seeking veterinary care for the dog.
- Vaccination against relevant serovars is part of risk-based prevention discussions with your vet.
- Related: leptospirosis overview, outbreak safety tips, kidney disease in dogs.
How dogs get infected
Spirochete bacteria enter through mucous membranes or broken skin. Standing water after rain, shared bowls outdoors, rodent infestations around feed sheds and working dog environments feature in many histories. Urban park puddles are not risk-free after flooding.
Not every wet dog gets lepto. Dose, serovar and the dog's immune status matter. Puppies and unvaccinated dogs often fare worse when infection takes hold.
Signs to watch for
- Fever and shivering
- Muscle pain and reluctance to move
- Vomiting, diarrhoea, loss of appetite
- Increased thirst then reduced urine as kidneys fail
- Yellow gums or skin
- Breathing changes if lungs are involved
- Bleeding tendencies in some cases
Mild infections can look like a vague fever. Severe disease progresses to acute kidney injury and sometimes liver failure within days.
When it is an emergency
Jaundice, collapse, little to no urine, continuous vomiting, breathing distress or bloody spit need emergency care. Tell triage staff if you suspect lepto so isolation and staff precautions can start early.
Zoonotic caution for families
Avoid urine contact. Wear gloves when cleaning accidents. Disinfect surfaces with products your vet recommends. Wash hands thoroughly. Seek medical advice for people who develop fever after exposure, especially children, pregnant people and immunocompromised household members. Do not let the sick dog share beds until cleared by your vet.
How vets diagnose and treat
Blood and urine tests show organ injury. Specific Leptospira testing (PCR, serology and other methods) supports the diagnosis. Hospital care often includes intravenous fluids, antibiotics chosen by the vet, anti-nausea support and monitoring of urine output. Early treatment improves outcomes. Some dogs need intensive care for kidney support.
Prevention conversations
- Risk-based vaccination as part of your dog's schedule when your vet advises it
- Rodent control around kennels and feed
- Discourage drinking from stagnant flood water
- Protect working and hunting dogs with tailored plans
- Keep backyard ponds and water features clean
Vaccine serovar coverage varies by product and region. Your vet matches the local picture. Vaccination reduces risk. It does not excuse ignoring muddy puddles after a flood.
After floods and farm stays
Hose mud off dogs and dry them, discourage puddle drinking, and book a vet chat if fever appears a few days after wet adventure. Working dogs in dairy or pig environments need tailored vaccine and hygiene plans. Tell your GP if you develop flu-like illness after nursing a lepto suspect dog, and mention the animal contact.
Kennel and daycare communication
Tell group-care providers if your dog is being investigated for leptospirosis so they can protect staff and other animals. Many facilities require vaccination status documentation. Even outside outbreaks, reducing shared water bowls outdoors and promptly removing urine from concrete runs lowers general disease pressure. Clean boots after farm visits before walking suburban dogs through the same mud.
FAQ
Can cats get leptospirosis too?
Cats can be exposed but clinical disease is less commonly recognised than in dogs. Hygiene still matters.
Is every kidney failure case lepto?
No. Many other causes exist. Testing guides treatment and family precautions.
How long is a recovered dog contagious?
Ask your vet. Shedding can continue for a period after clinical recovery, so follow isolation advice.
Does city living mean zero risk?
Risk is lower than farm flood plains, but rodents and urban water after storms still feature in cases.
Talk with a vet
Worried about puddle exposure or vaccination choices? A Dial A Vet veterinarian can help you weigh risk with your local clinic. Speak with a Dial A Vet vet.
References
- Merck Veterinary Manual. Leptospirosis in dogs.
- WSAVA. Vaccination guidelines discussion of Leptospira.
- Australian veterinary public health notes on leptospirosis as a zoonosis.
Disclaimer: Educational only. This page does not replace an examination or advice from your own veterinarian. If you are worried about your pet right now, contact your local vet or nearest emergency animal hospital.