Dog Leptospirosis: Prevention and Welfare in At-Risk Dogs

Leptospirosis is a serious bacterial infection of dogs with zoonotic implications, largely preventable through vaccination.

Key Facts

Leptospirosis is caused by Leptospira bacteria transmitted through water or soil contaminated with infected urine
Dogs that swim in rivers, lakes, or puddles, or encounter wildlife, are at highest risk
The disease causes severe kidney and liver damage — mortality rates without treatment are high
Clinical signs include fever, vomiting, jaundice, bleeding disorders, and acute kidney failure
Vaccination is available but requires annual boosters due to limited immunity duration
Leptospirosis can be transmitted from dogs to humans — zoonotic risk adds urgency to prevention

Welfare Considerations

Leptospirosis causes severe suffering — affected dogs experience multi-organ failure with acute kidney and liver disease, pain, and systemic illness. Survivors may have permanent organ damage. The zoonotic risk means that an affected dog may also threaten its owner's health. Welfare-centred prevention includes annual vaccination for all dogs with outdoor access, particularly those that swim in natural water bodies or live in areas with high wildlife density. Prompt veterinary assessment of dogs showing fever, vomiting, or reduced urination after water exposure enables early treatment that significantly improves survival outcomes.

What You Can Do

Ensure your dog receives annual leptospirosis vaccination, particularly if they swim or encounter wildlife
Seek urgent veterinary assessment if your dog shows fever, jaundice, or reduced urination after water exposure
Avoid letting dogs drink from stagnant puddles and natural water bodies in high-risk areas
Wear gloves when handling a dog suspected of leptospirosis infection
Alert your vet to recent water exposure history when presenting a systemically unwell dog