We use "Missing Link Plus" on our dogs' morning food. We've been using it for about 6 years now. A friend in rescue recommended it to us. It's canine formula with Glucosamine boasts healthy joints, sustained energy levels, healthy skin and coat, healthy digestive system and normal weight. It's called the "Superfood supplement." It's got flaxseed--which is fabulous for them as well. Their coats are noticeably shinier and judging from the fact that our large dogs lived to be 14 and 16 and we barely had to medicate joints, we swear by the stuff. It comes in a shiny gold bag and you can find it at PetSmart, Foster & Smith, etc. A 1 lb. bag will run close to $20, but you only need 1 teaspoon to 1 tablespoon per day (depending on the dog's weight). Worth EVERY PENNY.