Dog Leptospirosis and Urban Waterway Risks

Leptospirosis is a bacterial disease that threatens dogs living near contaminated water and is also transmissible to humans.

Key Facts

Leptospirosis is caused by Leptospira bacteria shed in urine of rats, raccoons, and other wildlife
Urban dogs that swim in, drink from, or walk through contaminated water are at risk
The bacteria can penetrate through skin abrasions or mucous membranes
Acute leptospirosis causes severe kidney and liver failure that can be rapidly fatal
Early signs include fever, lethargy, vomiting, and muscle pain
Treatment with antibiotics is effective when started early - diagnosis requires specific testing
Vaccination provides good protection against common serovars but not all strains
Leptospirosis is a zoonotic disease - infected dogs can transmit to humans

Welfare Considerations

Dogs with acute leptospirosis suffer from severe systemic illness including kidney and liver failure that causes significant pain and distress. The rapid progression means dogs can deteriorate from apparent health to life-threatening illness within days. Intensive care including IV fluids and antibiotics is required and still results in mortality in some cases. Survivors may have permanent kidney damage. The availability of effective vaccination makes leptospirosis a largely preventable disease, but vaccine use is inconsistent. Urban dogs that frequent waterways, parks with wildlife, or areas with rodent activity are at elevated risk and benefit most from vaccination.

What You Can Do

Vaccinate urban dogs against leptospirosis, especially those with water or wildlife exposure
Prevent dogs from swimming in or drinking from potentially contaminated urban waterways
Seek immediate veterinary care for dogs showing acute illness with outdoor exposure history
Wear gloves when handling dogs suspected of leptospirosis
Control rodent populations around homes to reduce environmental contamination