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Is my dog's scabby skin after flea treatment a bad reaction?

Updated on September 23rd, 2025

Pet's info: Dog | West Highland White Terrier | Female | spayed | 5 years and 2 months old | 22 lbs

Dog was treated w PetArmor Plus as a flea prevention for the first time. She now has patches of skin that are scabby & flaky & losing hair. In a bath the scabs came off to reveal red irritated skin. No odor. Doesn’t itch. Thoroughly checked for fleas and ticks, none found. Our other Westie is unaffected - they are together 24/7 & share bedding, food bowl, etc. No changes to diet or environment. Does this sound like a reaction to the flea prevention? Sores were noticed 9 days post treatment.

1 Answer

Most Helpful Answer

Laura Johnson VMD

Answered By Laura Johnson VMD

Veterinarian

Published on September 22nd, 2018

Hi, thanks for using PetCoach! Poor Molly!

I do not think it’s a reaction to the topical flea medication. It looks and sounds like a bacterial skin infection. Molly should see your vet for an exam and if they agree be prescribed an oral antibiotic. You can try the below shampoo. Bathe her twice weekly and allow the lather to sit on her for 10mins before rinsing.

Good luck!
https://m.drsfostersmith.com/product/prod_display.cfm?pcatid=27975
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