My dog has a movable lump on her leg, limping, and won't bear weight.

Question

Found a lump on my dog's ankle, the size of a quarter and it moves or "floats" around when I touch it, is not red or hot to the touch. I noticed it when Katie began limping last night and within hours it got bigger (started out the size of a nickel) and she will not put any weight on it at all now. ?? Please help!! Pet's info: Dog | American Staffordshire Terrier | Female | spayed | 65 lbs

Dr. Kristin DVM · Accepted Answer

This appears to be swelling in the knee joint. What we would consider the "ankle" is much lower in the leg. There can be a pocket of joint fluid on the inside of the leg. It is possible this is a skin lump at the exact spot of this fluid pocket, but I doubt it. I suspect she is not putting weight on the leg because she injured the knee, and now as the swelling increases it is becoming more and more painful. I recommend she be seen by a veterinarian to check the stability of the knee to determine if she ruptured her crainial cruciate ligament or CCL (which is like a human's ACL).

My dog has a movable lump on her leg, limping, and won't bear weight.

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