Q. I'm nervous, my dog was vomiting for few days 2 weeks ago, I also noticed a lump under arm pit around same time. Vomiting stopped, lump still there?

A. I'm guessing you're worried about the lump being a lymph node, and you're right to be. Typically a lymph node is about the size of a kidney bean when it's normal, and it's hard to feel them - we have to dig deep. If you can feel it, it's enlarged, which can indicate an infectious or inflammatory problem, and even cancer (although cancer typically makes the lymph nodes on both sides of the body enlarged). Your vet can aspirate the lump with a needle and tell you 1.) is it a lymph node, and if so why is it enlarged? 2.) if not, what is it?

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