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What is this lump on my puppy's belly after he was neutered?

Updated On September 23rd, 2025

Pet's info: Dog | Mixed Breed Large (61lb +) | Male | neutered | 7 months and 25 days old | 79 lbs

My puppy has a knot on the side of his abdomen. It was larger in size yesterday but today has gone down a bit. What could it be ? He was just neutered last week

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1 Answer

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Answered By Ricardo Fernandez, DVM

Veterinarian, Veterinary Oncology Resident

Published on December 7th, 2017

Thanks for using Petco Pet Education Center, formerly Petcoach! This could actually be a normal anatomical structure that you perhaps had not seen before. You can check to see if it is in the other side as well. If there is something similar on the other side then that makes it more likely to be a normal finding. Otherwise it 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. At that time they can also tell you if it really seems to be a lump or not. I am really hoping for something benign. Good luck and have a good night!

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