Tere was a big thing on the news yesterday and I heard it again on one of the good morning america type shows this morning that after several years and several different studies,they show that chondroiton has no effect on joints or bones.They said the glucosamine had some mind effects but had not different effects with the chond. combined and there were no effects of chond. by itsself.This was a study on humans and people with bone and joint diseases and starting stages of arthritis.I know it is not dogs but figured it was close.