Can Wildlife Spread Parasites to Pets? What to Watch For

Most of us share our yards with wildlife more than we realise. We’ve all had encounters with raccoons, skunks, squirrels, or mice. They’re regular visitors to our yards and homes, and most of the time that coexistence is uneventful. 

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But the wildlife moving through your property can carry parasites that are transmissible to pets, specifically dogs and cats. And most pet owners don’t know what to watch for until a vet visit turns up something unexpected. 

Here’s what’s actually out there and what genuinely reduces the risk.

Why Backyard Wildlife and Pets Are a Risky Combination

The risk is related to the encounter itself, but about proximity and habit.

When wildlife establishes a regular presence in your yard, the overlap between wildlife habitat and where your pets spend their time increases. This in turn compounds the opportunities for transmission significantly. 

Keep in mind, direct contact isn’t required here. Pets can be exposed through contaminated soil, faeces, standing water, or simply investigating the areas where wildlife has been active.

Dogs are at higher risk than cats due to their tendency to sniff, lick, and investigate ground-level surfaces. But outdoor cats face real exposure too, particularly through hunting behaviour that brings them into contact with infected rodents. 

What’s Living Near Your Yard

The species mix varies by region, but across Western Canada the wildlife you’ll encounter is pretty:

• Raccoons are the highest-risk species for parasite transmission in residential settings. They’re present throughout all of our service areas but are particularly dense in mature-treed urban neighbourhoods. They establish latrine sites, communal defecation areas, in yards, under decks, in garden beds, and near raised structures. These latrines are the primary transmission risk for the parasites raccoons carry.
• Skunks are common denners under decks, sheds, and porches across the prairies. We get consistent calls for our teams in Calgary, Regina and Saskatoon residential areas. Direct contact with your pets is rare, but ground-level presence creates exposure risk for dogs specifically through contact with contaminated soil and skunk latrine sites.
• Ground squirrels and tree squirrels are primarily an external parasite concern. Fleas carried by squirrels are a consistent source of flea exposure for outdoor pets, particularly dogs that investigate burrow entrances and tunnel areas.
• Mice and voles are easily overlooked but consistent carriers of parasites that cats pick up through hunting. An outdoor cat that’s an active hunter has regular, direct contact with a population that carries both internal and external parasites year-round.

The Parasites Worth Knowing About

Raccoon Roundworm (Baylisascaris procyonis)

This is the most significant wildlife parasite risk in Canadian residential settings. It’s a small-intestinal roundworm in raccoons. Raccoons shed eggs in their faeces, and once those eggs develop in the environment over several weeks, they can remain viable in soil for years. No matter if it is winter, rain or extreme heat, these eggs survive. 

Dogs become exposed when they sniff, lick, or investigate contaminated soil or raccoon faeces directly. In most dogs, infection causes no obvious symptoms. In more serious cases, larvae can migrate to the central nervous system and cause neurological signs. 

If you suspect your dog has had contact with a raccoon latrine site, you must visit a vet right away. 

Fleas and Ticks

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Wildlife is the primary carrier of fleas and ticks into residential environments. Skunks, raccoons, and squirrels all carry fleas into yards, where they can transfer to pets without any direct animal-to-animal contact. 

The blacklegged tick’s range is expanding across the prairies. And it’s through wildlife moving through yards that these ticks get deposited in grass, garden beds, and ground cover where pets encounter them. 

Year-round veterinary flea and tick prevention is increasingly relevant across all Western Canada, not just wooded or rural properties.

Giardia

Giardia is an intestinal parasite that wildlife like raccoons, beavers, and rodents can deposit in yard environments through faeces and contaminated water sources. 

People and animals become sick when they swallow the parasite, which is passed in the faeces of infected animals. Dogs that drink from standing water, puddles, or low-lying areas in wildlife-active yards are at consistent risk. 

The parasite is hardy and isn’t eliminated by standard outdoor conditions. If you notice gastrointestinal symptoms in a dog following time outdoors in a yard that wildlife accesses regularly, it’s time to visit the vet. 

Sarcoptic Mange

Sarcoptic mange is caused by mites and is transmissible between wildlife and domestic dogs through direct contact or contact with bedding areas. 

Skunks and foxes are the most common carriers in prairie urban environments. If you’ve noticed patchy fur loss or intense scratching in wildlife, that’s a warning sign worth taking seriously for your dog’s sake.

Signs Wildlife Has Been in Your Yard

Wildlife encounters often leave evidence before they leave symptoms. Knowing what to look for in the yard matters as much as knowing what to look for in your pet.

Here’s what to look out for:

• A regular patch of disturbed soil or faeces in the same area of the yard. Raccoon latrines are consistent and often near raised structures, garden beds, or fences.
• Digging at the base of your deck, shed, or fence line. Classic denning behaviour from skunks and raccoons.
• Your dog returning to investigate the same spot repeatedly, or rolling in something in a specific area.
• Scratching, skin irritation, or hair loss in a pet that spends time outdoors. This could possibly be due to mange or flea exposure.
• Gastrointestinal symptoms in a pet following outdoor activity. Worth a vet call regardless of whether you can confirm wildlife contact or not.

What You Can Do to Reduce the Risk of Parasite Transmission

The most effective thing you can do is keep wildlife out. How? Reduce what’s making your yard attractive in the first place:

• Secure compost bins with tight-fitting lids. 
• Remove standing water from the yard regularly.
• Clear debris, wood piles, and dense low vegetation from the base of your deck, shed, and fence line.
• Don’t leave pet food outdoors after feeding time.
• Check the yard perimeter before letting pets out at dawn and dusk.
• Keep pets on a lead in areas adjacent to ravines, creek corridors, parks, and naturalized green spaces.
• Keep up with your veterinarian’s recommended parasite prevention programme year-round. 

Our pest exclusion service addresses the entry points and denning zones that keep wildlife coming back.

If Wildlife Has Move In, Get in Touch with Buzz Boss

Prevention only goes so far. Once a skunk has denned under your deck or a raccoon has established a latrine site in your garden, the exposure will continue for as long as the animal is there. Also, wildlife that has found a suitable den or food source doesn’t leave voluntarily.

DIY removal attempts carry real risk. Cornering or startling wildlife is never advisable and that’s how direct contact incidents happen. Humane, licensed removal is both the legal approach and the safest one for your family and pets.

Our Wildlife Trapping and Removal service handles skunks, raccoons, and squirrels humanely and professionally. We provide wildlife services across Calgary, Edmonton, Red Deer, Regina, Saskatoon, and Winnipeg. 

If wildlife has made itself at home in your yard, call us for an estimate and let’s get your outdoor space back.