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What is this firm, movable lump under my dog's skin on his leg?

Updated On September 23rd, 2025

Pet's info: Dog | Mixed Breed Medium (23 - 60lb) | Male | neutered | 14 years and 8 months old | 58 lbs

My 14 year old collie cross has a lump the size of a hazlenut on his rear left leg. It is firm to the touch but moves freely underneath the skin. What could this be please

1 Answer

Most Helpful Answer

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Answered By Rebecca, DVM

Veterinarian

Published on August 27th, 2017

Hi thank you for using Petco Pet Education Center, formerly Petcoach. I would recommend having Rex evaluated by a veterinarian. The vet may want to do a needle aspirate, which is sticking a small gauge needle into the mass to get a few cells to examine microscopically; which may give a better indication of what this is. From there biopsy or excision maybe recommended or just monitoring it. A mass on a dogs leg can be anything from an ilenlargrf lymph node, abscess, cancer or benign tumor. The only way to know for sure is with a vet visit and some diagnostic testing.

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