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My dog's warm, blood-filled thigh lump grew fast. Is it dangerous?

Updated on September 23rd, 2025

Pet's info: Dog | Labrador Retriever | Female | spayed | 8 years and 11 months old | 86 lbs

My dog has what looks like a blood filled lump on her inner right thigh. It looks like more blood has pooled near the lump just under the skin. If this ruptures can she bleed to death? She's had the bump for a while but it just filled up enough to make it hard in the last 2 days. It is also real warm to the touch. Here are pics taken just a few days apart. She is a spayed 9 yr old black lab and is very healthy otherwise.

1 Answer

Most Helpful Answer

Answered By Jeffrey Milner

Veterinarian

Published on April 18th, 2018

These sorts of lesions are next to impossible to adequately diagnose without a physical exam the pet, and more importantly, the lesion itself. While I couldn't say with certainty, there is PROBABLY not enough of a blood supply to this mass to cause a large dog to bleed out. There are no certainties, but this would be highly unlikely. I would however be concerned if it is suddenly filling rapidly, hardening, and is located on a location that could affect Karma's mobility in the long run. Her her into the vet for an exam so they can determine the appropriate steps. Once they palpate it, depending on your desires, they may want to obtain some cellular or tissue samples to assess origin, they may want to remove the lesion entirely, or they may tell you to just leave it be. The last of those three is doubtful though given what you've described and how quickly it has enlarged and heated up. You might want to check her temperature at home as well with a regular rectal thermometer. Anything higher than 102.5 is considered feverish. If you have any other questions, fee free to repost or create a consultation with me. Hope this helps.

1Pet Parents found this answer helpful

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