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My dog has a hard, red, cyst-like bump on his penis. What is it?

Updated On September 23rd, 2025

Pet's info: Dog | Golden Retriever | Male | unneutered | 3 months and 18 days old | 34 lbs

My dog has a marble size red bump on the side of his penis that I noticed last night. It is hard like a cyst but idk

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Answered By Jessica Desrosiers

Veterinary Technician

Published on January 6th, 2020

That does look like some sort of growth or irritation. Due to its location, I would have it examined by your vet and a sample taken, especially if it's growing rapidly bothersome, or changing in appearance.

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