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Hi. My name is***** I'm very sorry to hear about this situation with Dahlia. In a situation where the initial work up ruled out diabetes mellitus, chronic renal disease, and hyperthyroidism - the concern goes towards cancer then. Sometimes it can be a very big challenge to find it and identify it. Lymphoma is a typical one of cats and it can be in the intestinal tract where the diagnosis is made most of the time by intestinal biopsies. Sometimes ultrasound evaluations will show certain layers being thick in the intestinal tract too to give further suspicion of that. I'm assuming that your vet was suspect of lymphoma as the use of prednisolone (a steroid) was started up to see how it would help. If she's not doing well as far as her quality of life, then the situation gets moved to one where further testing is needed or possible that quality of life decision. I know you questioned at home euthanasia and this is definitely something that certain veterinary clinics / mobile clinics do offer. You could talk to your vet and see if this is something that they can provide. There really aren't any safe / humane ways for an owner to let their pet go at home.