Well, the vet recommended that we remove the lump and have it biopsied. She said she was 80% sure it was something benign, but because of the location (front leg), if it got much larger it would be hard to remove. So I had to leave Oreo there, and she will have the surgery between 12 and 3 today. The vet will call me afterward to let me know how it went and what the lump looked like. I'll be able to pick her up after 5.

Thanks for your prayers and thoughts. I feel better that it's probably benign, and it will be reassuring to have it out anyway. Now, I just have to wait and pray that the surgery goes well.