Thanks,I'm just glad he wasn't on it long before I found out it was bad for him.I have no idea why he limps and either does the yet.It's his right front leg,sometimes I feel so bad because he walks around like a real old man.My Mom who doesn't like dogs at all even comments that she feels for him the way he hobbles around. I honestly don't know if he is in any pain from it,because when he is chasing Tub through the house,you don't notice his limp.I thought it wouldn't hurt to try something to see if it did help his limping at all.I'll try the buffered asprin in a day or two to see if that helps.