Can Humans Catch Leptospirosis From an Infected Dog?

Yes—but the risk is low. It is possible for humans to catch leptospirosis from an infected pet dog, though dog-to-human transmission is generally considered uncommon ^[1].

When transmission does occur, it is primarily through direct or indirect contact with the dog’s infected urine ^{[1] [2]}. Other bodily fluids, such as blood or tissues, can also carry the bacteria, but these are typically a concern only during veterinary procedures ^[2]. The bacteria can enter your body through open skin (like cuts or scrapes) or through mucous membranes (the moist linings of your eyes, nose, or mouth) ^[2].

While a leptospirosis diagnosis in your pet is stressful, practicing strict hygiene and safe cleanup protocols significantly lowers your risk of infection. Ordinary activities like petting your dog are not the main risk, but you should avoid contact with their urine, standing water, and soiled bedding.

What to Do Right Now

• Contact your veterinarian for a specific infection-control timeline for your household.
• Avoid bare-hand contact with your dog’s urine or soiled materials.
• Cover all cuts with waterproof dressings before handling the dog or their belongings.
• Keep children and other pets away from any areas where your dog has urinated.

How Long Is My Dog Contagious?

Dogs with leptospirosis can shed the Leptospira bacteria in their urine, sometimes even when they appear completely healthy ^{[3] [4]}. Importantly, studies show that dogs may continue to shed the bacteria in their urine even after they have started veterinary-prescribed antibiotic treatment ^[5].

Antibiotic treatment is intended to reduce or eliminate the bacteria in your dog’s urine, but the duration varies ^[5]. Follow your treating veterinarian’s specific infection-control advice, as a single negative test result does not always provide absolute clearance ^[6]. Treat your dog’s urine as potentially contagious until your veterinarian advises you to stop precautions.

Safe Cleanup and Hygiene Protocols

To protect yourself and your family, use a step-by-step approach when cleaning up accidents:

• Wear Protective Gear: Always wear disposable gloves when cleaning up urine or handling soiled bedding ^{[7] [2]}. If substantial contamination is possible, wear waterproof footwear or an apron ^[7].
• Clean Before Disinfecting: First, absorb the urine with paper towels and dispose of them.
• Use Disinfectants Safely: Apply a household disinfectant or bleach solution to the area. Always follow the product label’s required wet contact time and dilution instructions. Never mix bleach with ammonia or other cleaners.
• Avoid Aerosolizing Urine: Do not use high-pressure washers, hoses, or vigorous sprays to clean urine, as this can aerosolize the bacteria (create a fine mist) that you could accidentally inhale or get in your eyes ^[7].
• Wash Exposed Skin: After removing your gloves, wash your hands and any exposed skin thoroughly with soap and warm water ^[8]. If urine splashes into your eyes or mouth, or onto a cut, contact a clinician or public health service promptly for exposure-specific first-aid advice ^[9].

Can I Pass It to Other Humans?

If you were to become infected, the risk of passing leptospirosis to another person in your household is exceptionally low. Human-to-human transmission is biologically possible, but the most well-supported documented circumstance is vertical transmission (passing the infection from a pregnant mother to her fetus) ^[10].

Casual contact, sharing a home, and everyday touching are not established routes of transmission ^[10]. However, any pregnant or immunocompromised household member who has a significant exposure to the dog’s urine or who develops symptoms should contact a clinician promptly ^[10].

When to Seek Medical Attention

You should monitor your health starting from the date of your last possible exposure to the dog’s infected urine, which may have been before they were even diagnosed. The severity of human leptospirosis ranges from mild or subclinical illness to severe, life-threatening disease ^{[9] [11]}.

Watch for symptoms such as sudden fever, severe headache, muscle aches, vomiting, or red/bloodshot eyes (conjunctival irritation) ^[12]. If you develop any of these symptoms, seek medical care and explicitly tell your doctor about your exposure to leptospirosis ^[9].

Seek urgent or emergency medical care if you experience signs of severe illness, such as marked jaundice (yellowing of the skin or eyes) or reduced urination, which can indicate kidney impairment ^{[12] [13]}. Do not self-start antibiotics or arrange testing without clinical advice; a clinician must decide if prophylactic treatment is necessary for your specific situation ^{[14] [15]}.