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Why is my male dog's nipple swollen? What are the possible causes?

Updated On September 23rd, 2025

Pet's info: Dog | Mixed Breed Medium (23 - 60lb) | Male | neutered | 1 year and 3 months old | 28 lbs

Male dog nipple is swollen over the past week. Any ideas on what this could be ?

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1 Answer

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Answered By Andrea M. Brodie, DVM

Veterinarian

Published on December 28th, 2018

He may have been licking his nipple which would have possibly made it swell. However it is also possible that this is hormonal problem or even an infection. If the nipple keeps growing, or turns red or hot or starts discharging fluid, then you should take your dog to a veterinarian for an exam.

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