Why is my dog scratching, biting, and has bumps after flea treatment?

Question

My dog is a sharpei- basset hound mix. He is constantly biting himself and scratching. It feels like bumps underneath the skin and there is slight redness. He is treated for fleas and ticks. Please let me know what this could be. Pet's info: Dog | Mixed Breed Medium (23 - 60lb) | Male | neutered | 4 years old | 35 lbs

Sara Farmer, DVM · Accepted Answer

Allergies, either to something in the environment or less often to food, would be the most common cause of itching if Charlie is on a prescription flea preventative. He may have a secondary skin infection as well since you are feeling bumps. Mange can cause hair loss but usually isn’t significantly itchy.

Why is my dog scratching, biting, and has bumps after flea treatment?

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