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My dog has a hard lump near his waist post-ACL surgery. Is it serious?

Updated On September 23rd, 2025

Pet's info: Dog | Mixed Breed Medium (23 - 60lb) | Male | neutered | 6 years and 6 months old | 43 lbs

Hi - My 6 year old dog had surgery to repair his ACL one week ago, and is recuperating at home. He has been limited to a large crate during this past week. Today I noticed a hard-feeling mass near his waist on the same side as the leg which was operated on. It feels to be 1-2" in diameter. I am wondering if it could be a blood clot from the surgery? Our vet is closed today and I'm not sure if this could be an emergency or I can wait until tomorrow?

1 Answer

Most Helpful Answer

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Answered By Jenny, DVM

Veterinarian

Published on February 25th, 2018

It is not likely a blood clot, but may be an injection reaction from a shot he received for the surgery. If he is eating and drinking well, then I would not consider this an emergency but would definitely have your vet check the area tomorrow

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