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Why is my dog biting his tail after flea treatment? Is he irritated?

Updated On September 23rd, 2025

Pet's info: Dog | Mixed Breed Medium (23 - 60lb) | Male | unneutered | 1 year and 5 months old | 21 lbs

I gave my mixed Pit Chihuahua 21 lb of flea treatment between the shoulder blades and tail and since then he keeps biting at his tail I believe he's irritated from the flea treatment and I don't know what to do

1 Answer

Most Helpful Answer

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Answered By Andrea M. Brodie, DVM

Veterinarian

Published on July 8th, 2018

There is a possibility that he is irritated from flea bites at his tail and/or from the spot on. It is a well-known side effect that spot-ons can cause an itch, hair loss, irritation, but usually that irritation is gone within a few hours. Do not let him bite or lick or scratch the application location. You can put a loose t-shirt on him covering up the location or put on an e-collar. If the irritation has not subsided by tomorrow, or if Boy boy develops a wound , he will need to be seen by a veterinarian for an exam. In the meantime do not put cream or ointment onto the location where you applied the flea treatment.

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