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My cat is lethargic after a flea infestation. What should I do now?

Updated On September 23rd, 2025

Pet's info: Cat | American Shorthair | Female | unspayed | 2 months and 18 days old

After 2 days with a Cat sitter, my cat was infested with fleas and lethargic. I bathed her and treated with frontline. I'm worried about the lethargy.

1 Answer

Most Helpful Answer

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Answered By Dr. Melanie, BVSc MS

Veterinarian

Published on November 19th, 2016

Poor Catatrina! If she had a heavy flea infestation, that could cause the lethargy. I would monitor her for now, and if it continues over the next 24-48 hours, or she develops other signs such as vomiting, anorexia, or diarrhea, then I would take her into the vet right away. Because she had fleas, you will need to disinfect the house. Wash her bedding in hot soapy water, and vacuum the furniture and carpet surfaces. You can use a spray to kill fleas in the house, such as Indorex, or a flea bomb would work well to kill the fleas in the home.

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