Spot had his regular vet checkup on Tuesday and the vet was very concerned that he's having trouble putting on weight. She thinks that his blood sugars are not out of control enough to cause him to be underweight due to the diabetes, and he is eating more than enough, so there has to be an underlying cause unrelated to the diabetes. We recently transitioned over from FF classics to Food Fur Life raw chicken, and he seems to have a better general disposition about him - but he's hungry all the time despite getting more than double the recommended amount. I think something about the FF may have disagreed with him, but not enough to cause any serious symptoms like vomiting/diarrhea. He does have a history of pancreatitis episodes that usually lead to temporary anorexia, but I make sure he gets enough calories per day via assist feeding if necessary. All this is to say he's been eating 12oz+ of food per day for months, so based on the calories he shouldn't be underweight. The vet mentioned GI lymphoma as a possible cause so now I'm freaking out a bit.. does anyone have any experience that says this could be anything else?? Or any experience dealing with GI lymphoma that's not going to scare the crap out of me? I don't have all his blood work numbers yet, but will add to my spreadsheet as soon as I get them. The only thing she mentioned was an elevated BUN, but not worrisome yet.