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My dog has a lumpy, growing mass on his leg. What could it be?

Updated On September 23rd, 2025

Hi! This is a growth on my dogs leg; it has grown from about the size of an acorn to the size of a pretty big walnut. The texture is very lumpy, almost looks like grains of rice clumped together or a cluster of oblong shaped bumps in a cluster. It does not seem to hurt him but he also doesn’t like me to mess with it. Vet will remove but no definitive answer as to what it is.

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1 Answer

Most Helpful Answer

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Answered By Angel Alvarado, LVT

Licensed Veterinary Technician

Published on February 3rd, 2020

Without a physical exam or diagnostics, it is difficult to determine if this is something to worry over. Ideally, a fine needle aspirate or biopsy should be done to collect samples for pathology. This may provide a diagnosis. X-rays of the limb may be recommended to rule out bony involvement. Since you state it is growing, it should be removed before it becomes too large. As it is, that is a difficult area to close after a mass removal.

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