"Lucky" our retriever has a complete diet with the supplements from drools making way for any shortages of vitamins and other requirements in his daily diet. He is just a year and 2 months old and still in his growing phase and hence we rely on drools. Not just calcium, but also the skin and coat and the multi vitamins. We feed "lucky" anything but non vegetarian and hence it is a big PLUS to supplement it with essentials from DROOLS. Great Going !