I have been giving my lab mixed breed dog Glucosamine for the last several years--on advice of a vet.  Since my husband and mother swear that the people version help their arthritis and aches and pains, I figure why not the dog!  He will be 13 years old in two months and people can't believe he's that old--still jumps and runs around like a puppy.  I will continue to give him these tablets.