Yes, it probably is. We had a FOTH (Ferret Of the House) who did very well on insulinoma meds for a couple of years (even took them himself off of a spoon), but eventually resisited both meds & food. We realized in retrospect that he did not feel well anymore & we should have let him go sooner than we did. If you decide that it is time , it is very VERY hard, but most unselfish. Best wishes to you & your fuzzy both. Lisa [Posted in FML 6959]