My dobe is 8 years old and has always run with me. When he was young we'd go up to 7 miles because he wanted to, was a maniac and loved it. Lately he's telling me he's pooped around mile 2, should I not be running with him anymore??? He is in great health and the vet says he looks great for his age but I'm not sure if we should just be walking ONLY now or if I can still run these shorter distances with him? Anyone have experience with this??? He doesn't seemingly have ANY hip problems or issues with gait. This picture was taken this year so you can see he's a little runt but he looks fantastic for 8 years old! I'm just curious if any of you with older pups have experience with this. He's stubborn so would never tell me to stop unless it was too hot out. Just curious...