Spike has a sort of fatty feeling mass a little larger than a quarter on his left side towards the middle. I was freaking out when I felt that, so I checked him all over and I found a harder oblong shaped lump with a smaller circular hard lump right on top underneath his chin on his neck. His breathing seems kind of off as well. I knew he was getting old because he's not as active, but I never felt these until today. Idk if I'd really want to put him thru surgery because I do not know his actual age...i only know he is old. I got him and his brother splinter a little over a year ago. His brother splinter passed away about 6 months ago. When I got them they were already fully grown, so I'm sure that spike is close to 3 if not over 3 by now. I'm at a loss of what to do. He's my first rat. When I brought him home he chewed out of the box and sat on my lap the whole way home. I have such a connection with him...i don't ever want to lose him. I need advice. I'm scared he wont make it through surgery. Idk if he's in a lot of pain or not. He's breathing so oddly. He's just curled up on my lap right now. Should I just try to make his as comfy as possible? What should I do?