I flipped Toast over yesterday and discovered this: My mom took her to the vet later that day. The vet did a screening panel and said everything looked normal except some protein levels. (Sorry I can't be more specific, but my mom doesn't remember the details.) She also got 2 radiographs and said that the mass was the only one she saw. She prescribed Metacam (anti-inflammatory? An infection doesn't seem very likely though right? No increased WBC count.) and Clavamox (antibiotic?). The bump is very firm, and from the little I've read about mammary tumors (because I'm assuming that's what it is), if they crop up quickly like this it's usually malignant. That was last night. My mom called the vet today to see about getting it removed. We are now waiting on a radiologist (or something) to see what options we have with surgery, and we should hear back from her tomorrow. I'm a little overwhelmed. I don't know what I should do for this, and I'm hoping you guys have some suggestions. I figured removing it as quickly as possible would be the smart thing so it doesn't metastasize. Surgery is dangerous because Toast is only 5.9lbs and has an enlarged heart (I don't know why her heart would be enlarged...). What questions should we be asking the vet? She is also not spayed, which I have now learned put her more at risk for these tumors. Thanks for anything, even those special Chaz vibes.