Dexter is 4 yrs old. About a week and a half ago he was playing with our other Boxer Sophie who is also 4 yrs old. They were doing fine I asked them if they'd like to go for a walk and once we got out of the house Dexter started limping on his front right leg. I took him to the vet and he gave me some Rimadyl that really didn't help. Four days later I took him back to the vet and they took complete x-rays of that shoulder down to the paw. The x-rays showed nothing - great relief - but he is still limping as bad as in the beginning. He did have a yeast infection on that foot and was really chewing it hard on the underside. That has since cleared up with the use some medicated shampoo and drops. If anyone can please help me discover the problem I would really appreciate it.