conv: My pet has a tumor. The other day I noticed my pet has a growth on her lower belly. I fear it may be a tumor. What kind of pet is it? Hope your animal is okay! She's a rat_comma_ so her body is very frail. I'm sad that she likely will not make it. She's been with me through thick and thin. I heard rats make awesome pets_comma_ I'm so sorry! Is your rat in pain?