When we got our Golden Retriever from a rescue shelter, they sent along a bottle of Glyco Flex with it. He is an older dog and they said they helped him walk better but I have no way to compare the before and after effects.
Still, my wife takes Glucosamine herself and swears by it so I am going to keep getting it for the dog. I don’t see any particular side effects from it and the dog takes it without trouble.
Since I do know that there can be different results from different brands, I am sticking to the one he is used to. I am not going to stop it just to see what happens so I will accept the reviews about it.