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Should I worry about my female dog's soft mammary lump with discharge?

Updated on September 23rd, 2025

Pet's info: Dog | Italian Greyhound | Female | unspayed | 4 years and 10 months old | 11 lbs

i noticed my female dog has this lump of tissue on the right lower mammary gland on just one side and just one nipple and there is some kind of liquid coming out of it, the lump is not really hard either and she’s not pregnant & never has been i just don’t know if this is something i should be soo worried about, it’s never happened before

1 Answer

Most Helpful Answer

Ricardo Fernandez, DVM

Answered By Ricardo Fernandez, DVM

Veterinarian, Veterinary Oncology Resident

Published on July 5th, 2018

Thanks for using Petco Pet Education Center, formerly Petcoach! This could be a benign or malignant growth. There is no way of knowing what it is just based on its appearance. This is often differentiated by a test called a fine needle aspirate (FNA) which is a pain free, inexpensive and easy procedure which in most cases will help reach a diagnosis. Sometimes a biopsy is needed for a definitive diagnosis. I recommend that you have her evaluated by your veterinarian for further assessment and treatment. I am really hoping for something benign. Good luck and have a good night!
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