Permethrin is a common ingredient in flea treatments for dogs, but it is toxic to cats and should not be used on cats, nor should cats be allowed in direct contact with dogs that have been treated with a permethrin-containing product. Cats will start to salivate and shake within 10 minutes of exposure and begin to seize within 30 minutes, says veterinarian Rebecca Skinner, and cats that have been exposed to permethrin should be bathed immediately and taken to a veterinarian.
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