Payson eats Nutro Max and he really seems to like it. I also feed Corkscrew and Tibby Nutro Natural and love it, my favorite thing about it is that they seem to produce less "waste" in the litterbox than they did when they were on Science Diet. Corkscrew is also down to a healthier weight, and before he used to get colds all the time. He hasn't had a cold once since I switched them over a year ago. I'm not sure if it's the food or just a coincidence but I'm happy. Even the rats eat Nutro! They get a little of it mixed it with their fruits and grains, they range in age from 2 to almost 3 years (senior age for a rat) and they are very healthy!