What Is Leptospirosis?
Leptospirosis ("lepto") is a bacterial infection caused by Leptospira species. It's spread through contact with contaminated water, soil, or the urine of infected animals — especially rats.
It is zoonotic, meaning it can spread from dogs to humans.
In India, lepto cases spike during and after the monsoon season when flooding, stagnant water, and rat populations increase simultaneously.
How Dogs Get Infected
- Drinking from or walking through contaminated puddles, drains, or flooded streets
- Contact with rat urine on surfaces
- Swimming in contaminated water bodies
- Through cuts or wounds on the skin
- Nose, mouth, or eye contact with contaminated water
Symptoms
Symptoms appear 4 to 12 days after exposure:
Mild Cases
- Fever
- Lethargy
- Decreased appetite
- Muscle stiffness
Severe Cases
- Vomiting and diarrhoea
- Dark or bloody urine
- Jaundice (yellowing of eyes, gums, skin)
- Kidney failure — reduced or no urination
- Liver failure
- Bleeding disorders
- Death — if untreated, can be fatal within days
Diagnosis
- Blood tests — elevated liver and kidney values
- Leptospira antibody test (MAT) — confirms exposure
- PCR testing — detects bacteria in blood or urine
- Urinalysis — dark or bloody urine, protein in urine
Treatment
- Antibiotics — doxycycline or penicillin-based, typically for 2–4 weeks
- IV fluids — critical for kidney support and dehydration
- Anti-nausea medication — for vomiting
- Hospitalisation — often needed for 3–7 days in severe cases
- Dialysis — in cases of acute kidney failure (available at some Indian veterinary hospitals)
Recovery depends heavily on how early treatment starts.
Prevention
Vaccination
- The lepto vaccine is available in India and is highly recommended
- Usually given as part of the annual booster (7-in-1 or 9-in-1 vaccines include Leptospira strains)
- The vaccine does not cover all Leptospira strains but significantly reduces risk and severity
Environmental Precautions
- Avoid stagnant water — don't let your dog drink from puddles, gutters, or drains
- Leash walks during monsoon — control where your dog goes
- Wipe paws and belly after every outdoor session during rainy months
- Rat control — reduce rat access to your home and yard
- Avoid flooded areas — even shallow flood water is high-risk
For Humans Too
- Wash your hands after handling your dog during monsoon
- If your dog is diagnosed with lepto, inform your doctor — early human treatment is simple and effective
Key Takeaway
Leptospirosis is preventable with vaccination and common-sense monsoon precautions. Given how common it is in India, the lepto vaccine should be part of every Indian dog's annual health plan.
This article is for educational purposes only. If you suspect leptospirosis, contact your veterinarian immediately.