I was running my hands down the sides of my dog when I felt something strange. It's on her right side, in between her pelvis/hip area and her ribs, and it's about the size of a baseball. When she sits, you can still feel it, but it sort of moves with her body, like it felt like the lump/bump was squished down with her skin. However, when she is standing on 4 legs, and I feel the lump, it does not really feel like a ball so much as, let's say, a sort of hill. She did not have much of a reaction when I applied a little pressure to the bump, but I'm still worried. Could this be dangerous? I plan on checking it out with the vet, but I don't want to panic myself into thinking it's a tumor or cancer when really it's just a tissue defect and nothing to worry about. Please, let me know what this could possibly be. I have given you as much description as I can gather from my own observations.