And the vet bills have been staggering.... nearly $5000 over the last 2 1/2 years with hospitalizations and surgeries for urine-related illnesses (one of the troubles with older male kitties). We now have a special kitty formula to feed the cats that we purchase from the vet. It is denser than the food purchased in the grocery and very specific for nutrition. We have to measure it out daily and three cups is all they get. Amazingly it lasts all day. I never realized there was such a difference in the food purchased from a vet and the food purchased at a store!