The short answer
Yes. Cats absolutely get ticks. Outdoor and indoor-outdoor cats get bitten directly. Even strictly indoor cats can pick up a tick if your dog drops one on the carpet or you carry one in on your clothes. The good news: cats rarely develop clinical Lyme disease. The bad news: the dog products that protect against ticks can be lethal to cats.
Wait — indoor cats too?
Yes, but the route is different. A strictly indoor cat won’t go questing in the long grass at Bronte Creek. But ticks come into the house anyway:
- The dog brings them in. An unattached tick on the dog’s coat can drop off in the house and find the cat. Cats spend a lot of time low to the floor, on beds, on couches — exactly where dropped ticks end up.
- You bring them in. A tick on your pant leg from a hike or a bit of yard work can transfer to a piece of furniture and then to the cat.
- A window screen with a gap, or a brief escape outdoors — both happen.
So “my cat is indoor only” is not a complete shield. It’s a lower exposure profile, not zero exposure.
Cats and Lyme disease — the (mostly) good news
Cats are remarkably resistant to clinical Lyme disease. Per Cornell Feline Health Center, no naturally acquired clinical case of Lyme has been documented outside the lab in North America. Cats can develop antibodies after exposure (so they’ve been bitten by an infected tick), but they almost never get sick from it. We do not recommend routine 4DX-style screening for cats.
That said, “Lyme is unlikely” is not the same as “ticks aren’t a problem for cats.” There are three real cat-tick risks worth knowing:
1. Tick paralysis
Uncommon but possible. Engorged female Dermacentor ticks (and occasionally Ixodes) can secrete a neurotoxin during feeding that causes ascending hind-limb weakness, voice change, and breathing difficulty. Removing the tick almost always resolves it. If you see those signs, find and remove the tick and call us.
2. Cytauxzoonosis (“bobcat fever”)
This is a watchlist disease, not a current Halton risk. Cytauxzoon felis is carried by lone star ticks and American dog ticks, and it kills 40% of treated cats. Both vector species are expanding northward, but neither is established in Ontario yet.
3. The cat as a courier
Because cats groom ticks off their own fur, the ticks they bring into the house are more often unattached and crawling — which makes them more likely to bite a human elsewhere in the home. Children playing on the floor are particularly vulnerable. So a tick on the cat is a household risk signal even if the cat itself never gets sick.
The bigger danger: dog tick products
Here’s the part most multi-pet households don’t know. The very products that protect dogs against ticks can be lethal to cats:
- Permethrin is the active ingredient in K9 Advantix II, many over-the-counter spot-on flea and tick treatments, some flea collars, and DIY tick tubes.
- Cats lack the liver enzyme needed to metabolize permethrin.
- A cat exposed to permethrin can develop tremors, seizures, hyperthermia, and death within hours.
- Exposure can happen just from grooming or cuddling a dog treated within the past 48–72 hours.
K9 Advantix II is now available over the counter in Canada, which means more pet parents pick it up without a vet conversation — and more cats are at risk.
The household rule we put in every multi-pet patient’s chart: no permethrin products in this home. There are excellent non-permethrin alternatives for the dog, and there are cat-safe topical preventives for the cat (NexGard Combo, Revolution Plus, Bravecto Plus, Credelio Cat).
If you suspect any permethrin exposure in your cat — drooling, ear or facial twitching, muscle tremors, seizures, hyperthermia, ataxia, dilated pupils — call us immediately during regular hours, or our after-hours VetWise line. Don’t wait.
What to do if you find a tick on your cat
- Remove the tick gently. Cats often fight tweezers, so a Tick Twister is usually less stressful.
- Save it in a sealed bag and submit a photo to eTick.ca for species ID.
- Watch for lethargy, fever, decreased appetite, pale gums, or jaundice over the next 2 weeks. Call us for any of those signs.
- A tick on the cat means ticks are entering the home — re-evaluate the dog’s preventive and the yard.
For the full step-by-step, see what to do if you find a tick on your cat.
Should my cat be on tick prevention?
Outdoor and indoor-outdoor cats — yes. Strictly indoor cats — usually not necessary for tick coverage alone, but if there’s a dog in the house bringing ticks indoors, we often still recommend it. We’ll talk through your specific situation. There are good cat-safe options.
For the bigger picture in Halton, see our 2026 field guide on ticks.
Key takeaways
- Cats get ticks. Outdoor cats by direct exposure, indoor cats by transfer from dogs or humans.
- Cats rarely develop clinical Lyme disease, so they don’t need 4DX screening.
- The biggest cat-specific danger in a multi-pet home is permethrin — found in K9 Advantix II, certain flea collars, and tick tubes.
- Don’t apply dog tick products to cats, and don’t use permethrin products on a dog if you have a cat at home.
- If you suspect permethrin exposure in your cat (drooling, tremors, seizures), call us immediately.
References
- Cornell Feline Health Center — feline Lyme disease.
- Companion Animal Parasite Council — feline ectoparasite guidelines.