Bay Area Leptospirosis Alert: What Dog Owners Need to Know

carter2018
Jan 18
3 min read

Recent public health alerts out of Berkeley have raised concern among veterinarians, dog owners, and public health officials alike. Leptospirosis, a potentially serious bacterial disease, has been detected in multiple rats and at least two dogs near the Harrison Street encampment by Codornices Creek.

While no human cases have been reported at this time, officials stress that the risk to dogs is real and ongoing, especially in areas with standing water, recent rain, and rodent activity. The bacteria responsible for leptospirosis can linger in soil and water for weeks, meaning exposure can happen long after the initial contamination.

For dog families across the East Bay and beyond, here’s what you should know and what you can do now to protect your dog.

What Is Leptospirosis (and Why Dogs Are at Higher Risk)?

Leptospirosis is caused by Leptospira bacteria, most commonly spread through the urine of infected animals, especially rats. That urine can contaminate puddles, mud, soil, creeks, and standing water.

Dogs are particularly vulnerable because they explore the world nose-first. Unlike people, dogs do not naturally avoid puddles or muddy areas. As infectious disease experts noted in local reporting, dogs are simply more likely to encounter contaminated water during normal walks.

Infection occurs when contaminated water or soil comes into contact with:

The mouth or nose
Eyes
Mucous membranes
Small cuts or abrasions on the skin

Why This Is Happening Now

Public health officials point to a combination of factors that create a perfect storm for leptospirosis exposure:

Increased rodent populations in areas with limited sanitation
Warm weather followed by heavy rain, which allows bacteria to spread and survive longer
Flooding and runoff, which can move contamination into sidewalks, trails, and parks

Berkeley has designated the affected area a higher-risk “red zone” and initiated cleanup and rat eradication efforts expected to take at least 30 days.

What Dog Owners Should Do Right Now

This is not about panic. It’s about awareness and prevention.

1. Avoid puddles, creeks, and standing water

Do not let your dog drink from or wade through puddles, mud, or creek water, especially after storms or in areas with visible rodent activity.

Brindleden tip: Bring clean water and a portable bowl on every walk so your dog isn’t tempted by questionable water sources.

2. Talk to your veterinarian about leptospirosis vaccination

Many veterinarians now recommend the leptospirosis vaccine more broadly than in the past, especially for dogs living in urban or high-rainfall areas. Your vet can help determine whether vaccination is appropriate based on your dog’s lifestyle and health.

3. Be extra cautious after rain

Rain doesn’t wash risk away. It spreads it. Standing water after storms can significantly increase exposure risk, even in areas that usually feel safe.

4. Clean paws and legs after walks

Rinse and dry their paws and legs. If you have cuts on your hands, wear gloves while cleaning.

5. Know the symptoms and act quickly

Leptospirosis can initially look like other illnesses, so timing and exposure history matter.

In dogs, watch for:

Vomiting
Fever or lethargy
Jaundice (yellowing of eyes or gums)
Increased or decreased urination

In people, symptoms may include:

Fever and chills
Headache
Muscle aches
Red or irritated eyes

If symptoms appear and there has been possible exposure, seek veterinary or medical care promptly and mention potential leptospirosis exposure.

Can It Spread Between Dogs or People?

Health experts emphasize that leptospirosis is not spread person-to-person. Each infection generally results from direct exposure to contaminated water or soil. However, because it is a zoonotic disease (can affect both animals and people), caution around urine and veterinary guidance is important if a dog is diagnosed.

The Brindleden Perspective

At Brindleden, we believe dogs thrive when they can explore the world safely with their people. Community means sharing information that helps everyone make informed decisions.

If you’re in the Bay Area: