SESKStuff Everyone Should Know
SESK: Stuff Everyone Should Know · sesk.info/cat-fleas-dog-product-danger

Is it safe to put a flea product made for dogs on a cat?

No. Some can kill cats.

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  1. Yes, if you use half
  2. No, some can be deadly to cats ✔
  3. Yes, if it is a mild brand

Why: Some dog flea products contain permethrin or related chemicals that are deadly to cats. iCatCare says never use a dog flea product on a cat. Ask your vet for a cat-safe choice.

Huh, didn't know that: iCatCare says even contact with a recently treated dog can expose a cat to enough permethrin to be toxic.

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References

Answer: No, some can be deadly to cats. Some dog flea products contain permethrin or related chemicals that are deadly to cats. iCatCare says never use a dog flea product on a cat. Ask your vet for a cat-safe choice.

  1. iCatCare, Fleas and flea control in cats icatcare.org/articles/fleas-and-flea-control-in-cats
    NEVER use a flea product on a cat that has been formulated for use on a dog
    Checked 2026-10-11.

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