Permethrin

Permethrin Hazards for Cats

by Jill A. Richardson, D.V.M.
Veterinary Poison Information Specialist
ASPCA National Animal Poison Control Center

Fleas are a major problem for cat owners. Not only are these tiny creatures a nuisance, they are also the cause of many diseases such as flea anemia, flea bite dermatitis, and tapeworm infestation. Flea control is often a necessary step in maintaining your cat's health.

While there are many safe insecticide products available, cat owners should be careful when using flea products on or around their pets. Never use products labeled "for use on dogs only" on your cats. Cats react very differently than dogs to some insecticides and some products that are safely used on dogs can be deadly to cats, even in small
amounts.

For example, there are many permethrin spot-on products available for "dogs only." These contain high concentrations (45-60%) of permethrin insecticide. These permethrin products have a good range of safety when used on dogs, but even a few drops of concentrated permethrin could be lethal to a cat. The signs most commonly seen with these exposures in
cats include generalized tremors, muscle fasciculations, and seizures. Signs can develop within hours or may be delayed up to 48 hours. According to cases compiled by the ASPCA National Animal Poison Control Center, cats are most commonly exposed to these products by inappropriate application.

Though most cats will recover with prompt and appropriate treatment by a veterinarian, the best way to avoid serious problems is by using products strictly according to their label directions. Before using ANY product on your cat, read the label instructions completely. If you do not completely understand the instructions, you should contact the product manufacturer or your veterinary staff for clarification.

Remember, ALWAYS read the label. This could save the life of your cat!

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Contact Jill Richardson, DVM with questions or for reprint permission.