The Pet-Tabs CF (Calcium Formula) for Dogs and Cats is a calcium supplement that also contains phosphorus and vitamin D. These nutrients help maintain the cats and dogs healthy bones and teeth. This daily supplement can be served and mixed with food or can be served by hand prior to feeding. Dogs can take 1 tablet per 20 lbs. of body weight daily while cats may take 1/2 tablet per 10 lbs. of body weight daily.