Nan Cottage Grove, MN 2/7/2011 10:41:33 PM My Cavalier had three knee surgeries. Two on the left knee as the binder didn't hold so three surgeries in 2 days. He was 4 months old at the time & he is now 7 years old & his left hind foot is so painful, or numb, he chews on it constantly & howls like a wolf. We had our vet + the U vet check him & they couldn't find anything wrong. Help? Any ideas?