From your description it sounds to me like your boy's got some orthopedic issues, at a minimum. You should NOT be able to outrun him, and he may very well be in pain from the way you describe his movement. Does Rossco's vet know about these issues? If not, he/she needs to know ASAP. Make a vet visit. Oh, and Rossco should be pooping about an hour (give or take) after he eats. Good luck and keep us posted, ok?