I don't know any diabetic hoomans, but Barbara's had diabetic cats in the past, and usually is good about detecting the 'tell tail'' acetone smell on the cat's breath. The vet is getting her all alarmed by insising it's a 'brain tumor', and that he may have seizures over the weekend. Darling's been losing weight for some time now, and can easily consume 6-7 cans of wet food each day, and more, but I can't see how fur loss all of a sudden = brain tumor. It sounds to me as though Dr. Tom is pushing her to leting him go. My opinion is if he's still eating, and seems content, to not get drastic like that! Barb calculated that he's much closer to 20 years old anyway...how much longer does the old guy have? Let him enjoy eating her out of house, and home, and go from there.