I have a small male pit, almost 2 years old. He was a rescue dog who had been mistreated. My dog is very sweet, but an anxious dog. He also is almost totally blind, and has recently begun o have limping with his left back legs. It is almost as though he has aged very quickly. Is this possible? The vet says he has no retina in one eye and poor eyesight in the other. We just love this little guy, but have learned we have to keep his life predictable. So when out, he is on his leash even when running. He seems to be comforted by the leash. Anyone else ever had a dog like this?