Leptospirosis
A serious, zoonotic bacterial infection transmitted through contaminated water or wildlife urine that causes acute kidney failure and liver damage.
💬 In Plain English
Leptospirosis ("Lepto") is a dangerous bacterial disease caused by spiral-shaped bacteria (spirochetes) that thrive in standing water, puddles, mud, and slow-moving streams contaminated by the urine of infected wildlife like raccoons, rodents, and deer. When a dog drinks from puddles or swims in contaminated ponds, bacteria penetrate mucous membranes or scratched skin and multiply rapidly, attacking the kidneys and liver. Because Leptospirosis is zoonotic—meaning it can pass from infected dogs to their human family members through urine contact—early diagnosis and protective hygiene are paramount.
🔬 Clinical & Technical Depth
For Vets & TechniciansFormal Clinical Definition
Zoonotic systemic spirochetal infection caused by pathogenic serovars of Leptospira interrogans sensu lato, inducing tubulointerstitial nephritis, acute renal failure, and hepatocellular necrosis.
Why Veterinarians Use It
Veterinarians test for Lepto via urine PCR and microscopic agglutination testing (MAT) in dogs presenting with acute kidney or liver injury.
Clinical Context Encountered
Seen in outdoor, sporting, or suburban dogs exposed to puddles, lakes, wildlife, or city rats.
Clinical Reference Guide (Medical Condition)
Typical Presentation
Fever, vomiting, profound lethargy, muscle soreness, polyuria/oliguria, icteric gums.
Management Priorities
- IV fluid diuresis
- Ampicillin/Penicillin G IV initially
- Doxycycline 5 mg/kg PO q12h for 2 weeks to clear carrier state
- •Leptospirosis can be transmitted to humans through contact with infected pet urine: always wear gloves, wash hands thoroughly, and prevent pets from urinating on indoor surfaces or public parks during active infection.
❓ Questions to Ask Your Veterinarian
Take these actionable questions with you to your next clinic visit or appointment:
- 1Has my dog been tested with a Leptospira PCR and Microscopic Agglutination Test (MAT)?
- 2What protective precautions (wearing gloves, bleaching urine) must our family follow to prevent zoonotic transmission?
- 3Is intravenous ampicillin followed by oral doxycycline planned to clear the carrier state in the kidneys?
Academic & Clinical References
- 2023 ACVIM Consensus Statement on Leptospirosis in DogsOrganization: American College of Veterinary Internal Medicine (ACVIM) • Accessed: 2026-01-10https://www.acvim.org