i switch his kibble a lot. one brand this month, next month
something else and in between bags i'll buy a small bag
of something else. i use can food as a topping and when
i'm feeling lazy i'll feed him a can. i keep several different brands
and different flavors stored. i also add to his kibble:
fresh beef, chicken, fish, lamb, pork, pear, apple, blueberry,
human grade salmon oil, organic yogurt, raw egg, etc.