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How to treat fleas on a 3-week-old puppy and protect my cat and home?

Updated on September 23, 2025

Pet's info: Dog | Catahoula Leopard Dog | Male | unneutered | 17 days old | 3 lbs

We are getting a 3 week old Catahoula puppy from family members. Their dogs have fleas and now so does our potential puppy. What treatments or preventative measures can we take to insure it doesn't infect our home and cat.

1 Answer

Most Helpful Answer

Dr. Melanie, BVSc MS

Answered By Dr. Melanie, BVSc MS

Veterinarian

Published on November 16, 2020

Three week is way too young for a puppy to be separated from their mother. It won't even be weaned yet. The puppy should stay with it's mother until it's at least 6-8 weeks of age. Make sure your cat is up to date on it's flea treatment, and the puppy can only have Frontline Spray to kill the fleas. Best of luck.
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