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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?

4 Answers

Most Helpful Answer

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!

1Pet Parents found this answer helpful

Related Answers from Veterinarians

Answered By Ricardo Fernandez, DVM
Veterinarian, Veterinary Oncology Resident
Published on May 9th, 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 may even be an abscess. 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!
1Pet Parents found this answer helpful
Answered By Ricardo Fernandez, DVM
Veterinarian, Veterinary Oncology Resident
Published on December 2nd, 2017
Thanks for using Petco Pet Education Center, formerly Petcoach! These lumps are unlikely to be related to his previous gastrointestinal issue. These could be benign or malignant growths. 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!
1Pet Parents found this answer helpful
Answered By Ricardo Fernandez, DVM
Veterinarian, Veterinary Oncology Resident
Published on August 13th, 2019
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. However, this is likely a benign sebaceous adenoma based on what it looks like. 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!
1Pet Parents found this answer helpful

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