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What could be wrong with my Chihuahua?

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I have a Chihuahua that's a few years old. We noticed it was not feeling well, and not acting right. She has a lump or knot on her behind, and it looks swollen. What could be wrong, and is it serious?

My parents took her to the vet a while ago, they just haven't returned. I am just worried, and would like to know what it could be.