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My dog has a movable lump under skin near his penis. Is it a tumor?

Updated On September 23rd, 2025

Pet's info: Dog | Mixed Breed | Male | unneutered | 2 years and 3 months old | 2.5 lbs

There is a ball shaped mass next to my dogs penis it is only on one side and moves around like he has a ball under the skin and i am concerned it could be a tumor. He is a Chihuahua. The mass seems to be able to move the entire length from belly almost to his balls. Should i be worried?

1 Answer

Most Helpful Answer

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Answered By Ricardo Fernandez, DVM

Veterinarian, Veterinary Oncology Resident

Published on December 2nd, 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 him evaluated by your veterinarian for further assessment and treatment. I am really hoping for something benign. Good luck and have a good day!

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