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My dog has mastitis. Is black skin & open wound on her teat normal?

Updated On September 23rd, 2025

Pet's info: Dog | Mixed Breed Small (up to 22lb) | Female | unspayed | 13 lbs

I took my dog to the vet yesterday. She has mastitis. They prescribed antibiotics and anti inflammatory. The skin around the teat is all black and busted open. Now since the skin has busted open there’s a open hole about the size of a quarter where the black skin was. Is this normal?

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1 Answer

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Answered By Jenna Beyer, DVM, MBA, cVMA

Veterinarian, Certified Veterinary Acupuncturist

Published on October 18th, 2017

The black skin is dead tissue, and the hole underneath is the exposed mammary gland. Sometimes these types of mastitis can heal without surgery, but sometimes the dead tissue will need to be surgically removed to make it easier for the body to heal the wound. I would recommend that you have Daisy re-checked by a vet since this new wound appeared. I would usually start using special bandages on a wound like this to help remove remaining dead tissue and bacteria, include pain medications, and start hydrotherapy. Since these types of wounds can be very painful and irritating, Daisy should be wearing an e-collar 24-7 to avoid self-trauma.

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