my anatolian shepherd/pittbull mix is about 9 yrs old. before i got my other dog (about 3 1/2 yrs ago) he's started aging much faster.he's also become fater...im feeding him less food, and healthier food, but he hasn't lost weight. in the summer, i excercise him as much as i can, but he hasn't lost very much. im getting concerned about his health, because when a dog is obese, it tends not to live as long. this summer im going to try harder though....anyone have any suggestions?