Why give these to your pet? Like humans, even you, our pets have endocannabinoid systems. (Google that one if you don't already know about it.) The short version is, everything with an endocannabinoid system produces CBD, and other cannabinoids, in small amounts to help regulate the body's homeostasis. Think keeping everything in proper working order, or re-watch Bio-Dome (like you need an excuse right).
Anyhow, some of the supplements that might be replaced or be made to work better by these types of product include: Glucosamine, Chondroitin, and Fish Oil, just to name a few. So, if your pet suffers from arthritis or other digestive issues, maybe give these a try.