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My dog has a red, hairless lump on her neck. What could it be?

Updated On September 23rd, 2025

Pet's info: Dog | Rat Terrier | Female | spayed | 5 years and 11 months old | 26 lbs

My dog has a big red bump on her neck and there isn’t any fur in that area. What do you think it could be?

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2 Answers

Most Helpful Answer

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Answered By Dr. Elizabeth

Veterinarian

Published on September 28th, 2019

I recommend to have Lola examined by her veterinarian. Skin masses can be many things but red raised masses are especially concerning for a skin cancer called a Mast Cell tumor. An infection is also possible. Your veterinarian may need to collect a sample of cell to examine under the microscope to determine what this is and if further treatment is needed. Have this checked out soon.

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Other Answers

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    Answered By Jennifer Summerfield, DVM CPDT-KA

    Veterinarian, Certified Dog Trainer

    Published on May 27th, 2017

    The lump shown in the photo does look rather suspicious. Some malignant skin growths, such as mast cell tumors, have a very similar appearance to this - a raised, pink or red hairless lump on the skin. I would recommend taking Zoey to the vet to have this checked when you are able to - he/she can do a simple test called a fine needle aspirate to find out for sure what it is. Depending on the results, your vet can advise you on whether the lump needs to be surgically removed.

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