I have a dwarf hampster that is 2 years old. Last night I discovered a rather large lump on his left side by his back leg. It is pretty big and causes him to limp around a bit, but doesn't cause him any pain. He still runs around and I can touch it without him flinching or making any noises. I'm afraid that this lump might be a tumor. Is there anything else it could be? Is there anything I can do for the poor little guy? Please help me, I don't know what to do.



