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My unspayed dog has hard blue lumps near her nipple. Is it serious?

Updated On September 23rd, 2025

My unspayed dog has developed three little blue hard lumps next to her nipple . They don’t seem to bother her.

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Answered By Lotus Altholtz

Veterinarian, Board-Certified Lab Animal Medicine Specialist

Published on March 13th, 2019

She may have mammary cancer which is fairly common in unspayed dogs. Your vet can perform either a biopsy or a fine needle aspirate and cytology to confirm the nature of the mass. If it comes back as mammary cancer, full screening pre-operative bloodwork as well as chest radiographs to rule out metastasis to the lungs will likely be discussed. If chest rads show that cancer has already spread to her lungs, unfortunately surgical removal under anesthesia may not be practical. Good luck-

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