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What causes hair loss and red skin on my 3-month-old puppy's back?

Updated On September 23rd, 2025

Pet's info: Dog | Mixed Breed | Male | unneutered |

My dog hair/skin is coming off, leaving it red underneath.I don't know what to do .It's on his back.He is about 3 Months old.......What can i do?And what s this?

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1 Answer

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Answered By Dr. Heidi DVM, CVA, CCRT, CVTP, CVSMT, CVCH

Veterinarian, Certified Veterinary Acupuncturist, Certified Canine Rehabilitation Practitioner

Published on July 13th, 2018

It's impossible to say for sure, but the most common reason that I will see large areas of hair loss like that on the back are due to some type of burn to the skin due to hot liquid or chemicals. I have seen it most commonly due to hot liquids accidentally being spilled on the animal, but it takes days to start showing hair loss. The area closer to the tail looks like it is oozing, so I would be worried that the skin there is infected. I would recommend having your veterinarian examine Boss to see if they can find a reason for the hair loss and determine if he needs an antibiotic. If everything is treated, usually the hair will regrow in the area, but it can take some time depending on how damaged the skin was. I had a cat that had coffee spilled on him that took almost 6 months to fully regrow his hair. Good luck! I hope that was helpful. Thanks for using Petco Pet Education Center, formerly Petcoach.

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