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What's this red swollen area on my dog's penis? Should I worry?

Updated On September 23rd, 2025

Pet's info: Dog | Rottweiler | Male | unneutered | 1 year and 3 months old | 120 lbs

My dog (Rottweiler) has a red swolen looking lip on the tip of his penis. What is this? And should we worry?

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2 Answers

Most Helpful Answer

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Answered By Daniel Fonza, DVM

Veterinarian

Published on August 22nd, 2017

From the picture, it looks as if there is a small swollen sore on the prepuce. This could be a pustule or insect bite. I would keep an eye on this and monitor for any further changes. If this does not resolve after 3-5 days, I would have your vet check this out. If it changes or gets much larger before then, I would get Zeus looked at sooner. Your vet can insert a small needle into the area and get a better idea of what it might be. I hope this helps! Please let me know if you have any other questions / concerns.

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    Answered By Vanessa Yeager DVM MPH

    Veterinarian

    Published on

    Hello and thank you for using Petco Pet Education Center, formerly Petcoach! I see the small circular red mass on his prepuce. In order to find out what this is exactly, a veterinarian will need to take a small sample of it to look at the cells under a microscope. Possibilities may include a benign or cancerous tumor, sometimes in younger dogs, tumors on the penis or prepuce can be venereal in origin. I would have the sample taken from your veterinarian soon, and especially if this mass appears to be causing Zeus pain, discomfort, effecting his ability to urinate properly, or you notice discharge or bleeding coming from the mass. I wouldn't worry until your have received a diagnosis from your veterinarian. I hope this has helped! Best of luck to you and Zeus!

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