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What's this lump on my neutered dog's abdomen near his neuter scar?

Updated On September 23rd, 2025

Pet's info: Dog | Mixed Breed | Male | neutered | 3 years and 5 months old | 30 lbs

Hi. Noticed a lump on my dogs abdomen. He is 3.5 years old. Neutered. I'm not sure how long it's been there, the skin in that area previously looked uneven. Apparently his testicle had not descended before he was neutered. The lump is around the scar of where they removed the testicle (I think)

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3 Answers

Most Helpful Answer

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Answered By Joy Fuhrman, DVM, MBA, CPA

Veterinarian

Published on January 5th, 2018

It is possible that a hernia might have formed where the testicle was previously removed. Or this could be a mass unrelated to the testicle or the castration. Either way, you need to have Steven examined by your veterinarian to determine exactly what is going on here. Your veterinarian can make treatment recommendations once she figures out what is causing the lump.

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    Answered By Ricardo Fernandez, DVM

    Veterinarian, Veterinary Oncology Resident

    Published on

    Thanks for using Petco Pet Education Center, formerly Petcoach! This may be related to the neuter surgery though most likely represent a different issue such as him now having a tumor for example. This could be a benign or malignant growth. 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 best wishes!

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    Answered By Dr. Strydom, DVM

    Veterinarian

    Published on

    I think Steven needs to see your vet for an examination. That swelling is either a hernia, a tumor or a retained testicle. When dogs are neutered the vet is supposed to remove both testicles even if one is not descended. If it is not descended it is either in the inguinal region or still inside the abdomen. The vet will need to remove it from one of those locations. It is not recommended to leave it inside and only remove the descended testicle. So, if they never removed the retained testicle then that is likely what you are seeing. Retained testicles often turn cancerous due to the high temperatures of being inside the body instead of in the scrotum. If this is the case here, then that testicle needs to be removed as soon as possible. Hope this helps. Best wishes.

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