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Avoiding medication and flea-product mix-ups

Quick answerIn a home with dogs and cats, never use a dog flea or tick product on a cat. The ASPCA warns that permethrin, common in dog topical products, can cause unsteadiness, tremors and seizures in cats. The CDC says to ask a vet before using any tick product on a cat.

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Published Oct 19, 2026 · Updated Oct 19, 2026 · By the Editorial team. General education, not veterinary advice and not yet individually reviewed by a licensed veterinarian. About and sources

Rules that prevent mix-ups

  1. Keep each pet’s medications in a labeled container with the pet’s name and species.
  2. Give medications at set times from a written schedule, and tick them off.
  3. Store dog and cat products apart. Read every label.
  4. Keep prevention products away from cats after application until the product is dry and safe, per the label and your vet.
  5. Never give a pet another pet’s medicine, and never give human medicines unless your vet says so.

What the sources say

  • ASPCA: cats are sensitive to permethrin, especially at dog-product concentrations. Products with high concentrations typically warn not to use on cats.
  • CDC: cats are extremely sensitive to a variety of chemicals. Do not apply tick prevention products to cats without asking your vet.

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If it happens

If a cat may have been exposed, call your veterinarian or ASPCA Poison Control at (888) 426-4435 or Pet Poison Helpline at (855) 764-7661 right away.

Use reminders

PawLine lets you set medication schedules for each pet, sends push notifications and tracks dosing history, so the dog’s and cat’s schedules do not blur.

Frequently asked questions

Can I use dog flea treatment on my cat?

Not without asking a vet. The ASPCA and CDC warn that cats are very sensitive to some dog products, such as those with permethrin.

Sources

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