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Caution with permethrin will keep cats safe, veterinarians say

The concentration of permethrin in household sprays is too low to harm all but the most sensitive cats, experts say, but cats should nonetheless be kept away from the products and clothing that has been sprayed. However, applying permethrin-based insect repellents made for dogs can cause serious harm to cats, says veterinarian Lisa Murphy of the University of Pennsylvania School of Veterinary Medicine, and cats showing neurological signs of exposure should be taken to a veterinarian immediately.

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