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My dog is biting and losing hair after flea meds given yesterday.

Updated On September 23rd, 2025

Pet's info: Dog | Mixed Breed Medium (23 - 60lb) | Female | spayed | 10 months and 22 days old | 43 lbs

dog biting but losing hair. she has flea medication given yesterday.

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1 Answer

Most Helpful Answer

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Answered By Sara Farmer, DVM

Veterinarian

Published on June 7th, 2019

The hair loss pattern is suggestive of flea dermatitis, so I'm wondering if you've seen fleas any time recently before giving flea medication. If not, it's possible that Minnie has food or environmental allergies or a different kind of external parasites. I'd recommend having a vet examine her to determine what might be going on.

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