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Why does my golden retriever have a black crusty rash at tail base?

Updated On September 23rd, 2025

Pet's info: Dog | Golden Retriever | Male | neutered | 11 years and 1 month old | 77.4 lbs

I've seen skin infections on my golden retriever before which generally appear under his thick coat as a red ring and have a flaking. But now I'm seeing a dark black kind of crusty rash at the base of his tail unlike any rash we've other ever seen before. And it's not quite a scab it kind of flakes off weird in these perfect little tiny sticks

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Answered By Vanessa Yeager DVM MPH

Veterinarian

Published on October 21st, 2017

Hi there and thanks for posting! That tail looks very raw! It is hard to say exactly what the cause of Hunter's skin/ hair condition may be without examining Hunter first, but I can offer some possibilities. Skin irritations around the tail base are a signal of a flea allergy. It only takes one flea to induce a flea allergy! If Hunter is not on any flea preventative monthly, then this could be the culprit. It could also be a bacterial or yeast infection. our veterinarian can diagnose these potential conditions with a few simple skin tests. I would recommend Hunter visit his vet soon to have the possibilities above ruled out. He may need flea preventative/treatment as well as an anti-inflammatory and antibiotics/anti fungals. Best to you and thank you for using Petco Pet Education Center, formerly Petcoach!

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