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Leptospirosis in Dogs — Calgary

Leptospirosis is a bacterial infection caused by Leptospira species, transmitted through the urine of infected wildlife — coyotes, rats, mice, deer, skunks, and raccoons — that contaminates water and soil. Calgary's Bow River corridor, Fish Creek Provincial Park, Nose Hill Park, and any green space with significant wildlife presence creates genuine exposure risk for dogs that walk near water, play in wet grass, or drink from natural water sources. The 2022 AAHA Canine Vaccination Guidelines recommend annual leptospirosis vaccination for all dogs with outdoor, water, or wildlife exposure.

Key Context

Why This Matters

Preventive

Leptospirosis can cause acute kidney failure and liver damage in dogs — and it's zoonotic, meaning infected dogs can pass it to humans through urine contact. In severe cases, leptospirosis is fatal without aggressive treatment. The disease is treatable with antibiotics when caught early, but organ damage from delayed diagnosis can be permanent. Vaccination is highly effective, annual, and now recommended as near-standard for Calgary dogs given the city's wildlife profile.

Evidence-Based

Key Facts

Source: 2022 AAHA Canine Vaccination Guidelines

Leptospira bacteria are shed in the urine of infected wildlife and can survive in water and moist soil for weeks to months — a dog doesn't need to encounter infected wildlife directly.

2022 AAHA Canine Vaccination Guidelines

Incubation period is 2–12 days — a dog can appear healthy for up to nearly 2 weeks after exposure before showing signs of illness.

2022 AAHA Canine Vaccination Guidelines

Without treatment, leptospirosis can progress to irreversible kidney and liver failure within days of clinical signs appearing.

2022 AAHA Canine Vaccination Guidelines

The current L4 vaccine covers the 4 serovars (Leptospira strains) most commonly implicated in canine disease in North America — annual administration is required because immunity wanes.

2022 AAHA Canine Vaccination Guidelines

Leptospirosis is zoonotic — humans can be infected through contact with an infected dog's urine or contaminated water, via skin abrasions or mucous membranes.

2022 AAHA Canine Vaccination Guidelines

Calgary's wildlife reservoir — coyotes, rats, mice, deer, skunks, and raccoons — all carry Leptospira. Urban parks with wildlife-adjacent dog access create genuine exposure risk distinct from purely rural settings.

City of Calgary wildlife monitoring data

Action Steps

What Owners Should Do

Practical steps you can take right now.

  1. 1

    Discuss leptospirosis vaccination with your vet — it is classified as noncore nationally but increasingly treated as near-core by Calgary veterinarians given the city's wildlife and river system.

  2. 2

    Vaccinate annually if your dog has any outdoor exposure near water, parks with wildlife, or areas with known coyote, rodent, or deer activity.

  3. 3

    Prevent your dog from drinking from natural water sources — rivers, streams, puddles, and standing water can all carry Leptospira.

  4. 4

    Keep your dog away from areas where wildlife congregate or defecate — river banks, naturalized park edges, and areas with visible rodent activity.

  5. 5

    If your dog swims in the Bow River or natural water sources in Calgary parks, discuss this directly with your vet in the context of lepto vaccination.

  6. 6

    If you suspect exposure or your dog develops fever, muscle pain, vomiting, or lethargy after outdoor water contact — call your vet immediately and mention the exposure history.

  7. 7

    Use gloves if you handle the urine of a dog suspected of leptospirosis — zoonotic transmission through urine contact is real.

Red Flags

Warning Signs to Watch For

Know when something needs attention.

  • Sudden fever, muscle pain, and reluctance to move within 2 weeks of known water or wildlife exposure — possible early leptospirosis.
  • Vomiting, increased thirst and urination, and jaundice (yellowing of the whites of the eyes or gums) — signs of kidney and liver involvement requiring urgent care.
  • Sudden collapse or extreme lethargy in a dog with recent outdoor water exposure — treat as an emergency.
When to See a Vet

Call your vet immediately if your dog shows fever, muscle pain, vomiting, or jaundice within 2 weeks of water exposure or known wildlife-dense park access. Tell them specifically about the exposure — leptospirosis is frequently missed when the exposure history isn't mentioned. Early antibiotic treatment can prevent the progression to organ failure.

From the Pack

The PAWS Perspective

What We See

Pack walks in Calgary's parks and green spaces are part of what makes PAWS different. Our dogs get outside every single day. Those same parks — Fish Creek, the river pathways, Nose Hill — have coyotes, deer, and rodents year-round. That wildlife presence makes leptospirosis relevant to every dog in our pack, not just the ones who swim.

How Daycare Connects

We highly recommend leptospirosis vaccination for all PAWS dogs. We can't require it today, but we tell every owner about the risk — particularly those whose dogs use our pack walks through naturalized areas. As Calgary's vet community continues to move lepto toward standard of care, we may revisit our policy.

Eric's Take
"I vaccinate all my own dogs for leptospirosis. When I walk our pack through Fish Creek and I see coyote tracks by the water, it's not abstract. Leptospira in that water is a real possibility. I'd rather have a conversation about a vaccine than field a call about a dog in acute kidney failure. Get the lepto vaccine if your dog has any outdoor exposure in Calgary."

— Eric Yeung, Owner, PAWS Dog Daycare

Honest Note

Leptospirosis vaccination is a recommendation at PAWS, not a current enrollment requirement. We are not veterinary professionals and this guidance reflects the 2022 AAHA guidelines and Calgary-specific context — confirm the right protocol for your individual dog with your vet.

Common Questions

Leptospirosis: The Disease in Calgary's Water — FAQs

Is leptospirosis actually a risk in Calgary?
Yes. Calgary's river system, urban park network, and wildlife population — coyotes, rodents, deer, raccoons — create conditions for Leptospira to persist in the environment. The risk is not the same as a rural farm dog, but it's not theoretical either. Calgary vets are vaccinating for lepto at increasing rates for exactly this reason.
Which Calgary parks carry the highest lepto risk?
Parks along the Bow River, Fish Creek Provincial Park, Nose Hill Park, and Carburn Park have significant wildlife activity including coyotes, deer, and rodents — all Leptospira reservoir hosts. Any naturalized park with water features and wildlife access warrants discussion with your vet about vaccination.
What does leptospirosis look like in dogs?
Early signs: fever, muscle pain, depression, loss of appetite. As disease progresses: vomiting, increased thirst and urination, jaundice, and eventually signs of kidney or liver failure. The timeline from exposure to acute illness can be 2–12 days, and the disease can progress rapidly once clinical signs appear.
My dog just waded in the Bow River — should I be worried?
One exposure doesn't mean illness — the bacterial load and strain present in any given section of water varies. But if your dog does this regularly without Leptospirosis vaccination coverage, the cumulative risk is real. Talk to your vet about whether vaccination makes sense for your dog's lifestyle, particularly if river access is routine.
Can my family get leptospirosis from our dog?
Yes, in theory — through contact with the urine of an infected dog, via skin abrasions or mucous membranes. Documented human-from-dog transmission is uncommon but reported. Practicing good hygiene around a sick dog and seeing a physician if you develop fever and muscle aches after exposure is the right protocol. Vaccinating your dog also protects your family by reducing the chance of a dog becoming a shedding source.
Is the lepto vaccine safe? I've heard it causes reactions.
The older 2-serovar lepto vaccines had a higher rate of mild reactions than other vaccines. The current L4 (4-serovar) vaccines have a significantly improved safety profile and are well-tolerated in most dogs. Minor soreness and lethargy for 24 hours after vaccination is common across many vaccines and not specific to lepto. Discuss any specific concerns with your vet — the risk of leptospirosis in a water-active Calgary dog typically outweighs the vaccine reaction risk.
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