First option the vet offered was the euthanasia. Of course, i send him to hell, since Gonzalo was not suffering. He was even more alive than ever, hunting every piece of food he could find, even broccoli. After 3 or four months, i decided to change Gonzalo to a tight regulation with Lantus , after changing all the diet ( no carbs!) and saying good bye to free feeding. I bought a glucometer , learned how to use it and taught to Gonzalo to be quiet. It was hard, but not too much. I decided to use the german protocol .