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Why is my dog chewing her tail and getting sores on her back?

Updated on September 23rd, 2025

Pet's info: Dog | Mixed Breed Large (61lb +) | Female | spayed | 4 years and 2 months old | 97.2 lbs

My dog princess is chewing on her tail and she has sores on her tail and her back

1 Answer

Most Helpful Answer

Dr. Melanie, BVSc MS

Answered By Dr. Melanie, BVSc MS

Veterinarian

Published on February 26th, 2017

This is a common area for dogs to chew when they have fleas, and it is possible that is what is causing Princess's symptoms. If she isn't up to date on her flea treatments, I can give you one for her. First, I would give her Capstar. It's a one time pill that starts killing fleas within 30 minutes. Then follow up with a spot on treatment, such as Advantage or Revolution. This is a treatment that has to be used once a month. You will also have to disinfect the environment. Wash her bedding in hot soapy water, and vacuum the furniture and carpet surfaces. You can use a spray to kill fleas in the house, such as Indorex, or a flea bomb would work well to kill the fleas in the home.

If Princess is up to date on her flea treatments, other causes include mites, allergies, and ringworm. In that case, I recommend taking her into the vet for an exam tomorrow. The vet can do blood tests, skin scrapings, and use a Wood's lamp to diagnose allergies, mites, and ringworm. Once the cause of the biting and sores is found, the vet can prescribe the appropriate treatment.
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