I think that Karen has a great way of asking without offending anyone. I also agree that it would be a hard case to prove if you would call animal control. If the dog has a doghouse, food, water and looks healthy, unfortunately that is usually all that is required by law. Under the circumstances, I think the best bet would be taking him for walks/runs with you. That way he gets attention and you get healthier. He will really appreciate it. Let us know how it goes.