What's really in those dog chews? By weight, the leading vitamin dog chews on Amazon are actually more filler, binder and flour than active ingredient. Instead of putting more ingredients in each chew, they make you buy 3-5 tubs of different chews. One for gut health, one for mobility, one for vitamins. And they're mostly fillers. Skip the mystery powders. Goodboy Gravies supports five specific areas of canine health: multivitamin, digestion, hip and joint, skin and coat, and immunity with one single drizzle. Less to buy, more of the good stuff to give your pup!