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Hello,Thank you for using Just Answer. My name is***** am a veterinarian and will do my best to help.
I am sorry to hear you are worried about Yellow.
I see he is vomiting, and that he is overweight and a lazy groomer. When you took him to your veterinarian, what did they do; what did they say? How can I be of help?
What food is he getting?
Is he eating?
If he is eating, and drinking, one option is for you to start the insulin injections at home, and then bring him back in a few days to see what his blood sugar is. Some diabetic cats will to into remission if treated with insulin, started on the correct diet, and if they lose weight.
If he is not eating, he may need to be getting IV fluids, and hospitalization.
If he were my cat, or my patient, I would not be ready to talk about euthanasia if he is still eating.