Hey Doc, I have a question about giving my Rottweiler Glucosamine and chondroitin. We've been giving him the stuff from the pet shop for a couple months and it really seems to be helping out his back hips. He seems to be more active and gets up and down easier than before, still not great but better. My question is, is there any difference in what the pet stores sell and what you buy for humans besides the price? If its the same stuff I could save a lot of $ by getting the other. If not, I don't mind getting the G&C from pet shops, he's a really old dog and I wanna make him as comfortable as possible for his remaining time with us. If its ok, how much would I give him of it? Also, since I've been giving that to him I haven't been giving him Aspirin. Would It be safe to give him both and how much aspirin with it? He's around 160-170 pounds and somewhere in his teens age wise. Any info and help is greatly appreciated! Thanks!!!