"It's important for pet owners to read the label and follow the directions carefully," says Steve Hansen, D.V.M., director of the ASPCA Animal Poison Control Center.
There are potential side effects with the misuse of flea control products comtaining ingredient permethrin, which is commonly found in many insecticides. Concentrated permethrin can be lethal for cats, though most dogs can tolerate it. Do not use products on cats that are labeled only for use on dogs. Avoid using the product on pets that are younger then suggested on the medications label. For kittens and puppies, alternative flea protection methods should be used instead, such as mild soap and water baths, and using a flea comb.