We used it for over 5 years for Calli and Berkeley, we bought the Glucosamine/Chondritain (sp) from Sam's Club. It is around 15.00 to 18.00 a bottle but that is for alot of tablets. We checked with our vet first to make sure it was okay to give it to them and they said it was fine. Our dogs just took it every morning with no problems, we started out giving it to them in a small piece of bread and eventually they just ate it straight. We give them Vit. E tablets also recommended by our vet and they take those with no problem either (also from Sam's).
We also give ivormec (heartguard) in the liguid form (the type used for cattle). We started that when calli was about 3 and have continued it for the rest of them after they are over 1 year. We give it year round.
It is about 40.00 for a bottle which will last 2 years with multiple dogs. CAUTION on that is that collie's and one or two other breeds (can't remember right now which ones) CAN NOT take it that way and have to have the heart guard tablets. Boxers are fine on it (we made sure we checked with our vet(s) BEFORE giving it to them. It was actually recommended to us by a friends sister who is a vet. Really helped out when we had three dogs.