My dog suddenly stopped eating and had black poop. i did research and discovered he has been having blood in his poop for months, ever since we moved to a new house actually. Now he eats small amounts of foo through out the day, but the blood is still there, just not as much. If he exercises alot, he bleeds more and stops eating again. Same thing if he gets stressed, or his routine changes. We can't afford a vet visit, but i think he has ulcers. His mom did the same thing. He is a very sensitive dog. Any thoughts or advice???