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My dog has chronic skin sores and fur loss. Could it be allergies?

Updated On September 23rd, 2025

Pet's info: Dog | Pembroke Welsh Corgi | Female | spayed | 7 months and 12 days old | 25 lbs

Mia is back to having her skin sores again and losing fur in the spots on her sores but she has so much fur you can’t tell unless you really dig through the layers. Anywho, I have to get to the bottom of what is going on with her skin SINCE SHE WAS BORN! Please, tell me what I can do??? My vet and i, what can we do??? Every other month she has sores....tried derm caps, special shampoo (vet), probiotics, special diet...PLEASE HELP!! Tests???

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1 Answer

Most Helpful Answer

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Answered By Ricardo Fernandez, DVM

Veterinarian, Veterinary Oncology Resident

Published on August 12th, 2019

Thanks for using Petco Pet Education Center, formerly Petcoach! This is possibly due to allergies. It really comes down to figuring out what is causing her allergies so that they can be treated or the specific allergen avoided. A secondary infection is likely and also needs to be addressed. There are medications such as Apoquel or prednisone which may help with the itch. 

 There are many things that can cause allergies though in most cases they can be broken down into 3 big categories: flea, food and environmental allergies. 

Allergies are usually worked up in a stepwise fashion starting with flea allergies as this is the easiest and cheapest to take care of. If not on a flea preventative, then it would be a good idea to get started on one. If already on one then it would be a good idea to change to something else (there are many new products out in the market). 

If not improved in 1-3 months then it is time to move on and check for food allergies by switching to a novel diet (new protein and new carbohydrate). If that does not seem to be the issue then you are left out having to check for environmental allergies which require blood and/or skin tests.

 Allergies can be very frustrating to deal with at first but so rewarding at the end when we are able to treat them effectively!

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