Does my doggy have cancer?

She has these 2 large mass balls around her anus that feel like testicles. one on each side. The vet says has nothing to do with anal sacs but will not tell me what they are! I keep asking him if it's cancer and he just keeps saying "large mass".... yes, I know that already!!! Instead he keeps talking... show more She has these 2 large mass balls around her anus that feel like testicles. one on each side. The vet says has nothing to do with anal sacs but will not tell me what they are! I keep asking him if it's cancer and he just keeps saying "large mass".... yes, I know that already!!! Instead he keeps talking about how old she is and wanting to put her down. If I want to test her for cancer he wants $700!!!!!

So any ideas what it could be????
Update: She is 14 year old Chihuahua.
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