I give my dogs a fish oil cap each day just because I take them myself and figure they should be good for the dogs too, right? If any of them have any tummy issues, instead of a store bought probiotic, they get a few spoonfuls of plain greek yogurt for a few days. More energy than is easy to keep up with, shiny coats, regular stool, what else would they need? Some of you using mail order supplements might want to check into the history of some of these labs. Do your homework before investing a lot of $$$ in snake oil.