My dog has a painless lump on his back leg near the knee. What is it?

Question

My Westie has recently developed a lump/swelling on the side of his back leg near the knee joint. He has not shown any signs of discomfort or any difficulty walking. What could cause this? Pet's info: Dog | West Highland White Terrier | Male | unneutered | 8 years and 2 months old | 8 lbs

Dr. Elizabeth · Accepted Answer

It's possible that the swelling on Max is a skin tumor and those are generally not painful, even if they are a malignant cancer. Sometimes the joints themselves can swell for various reasons as well. Anytime a pet get a lump/bump, I always recommend to have it checked. Sometimes the vet can tell what it is just by examining it. Sometimes though they need to take a small sample of cells to look under a microscope. Most skin tumors are benign but malignant tumors are possible. Identifying the cells is the only way to know what it is. I hope this helps and please feel free to post any additional questions.

My dog has a painless lump on his back leg near the knee. What is it?

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