Just came home from work. We switched Duke over Saturday to Natures Variety instinct beef and lamb, bowels have been perfect, he has been fine. Today he had to go right out and had very runny bowels and then was squatting and actually had some blood come out? I am really worried.. do you think this is from food? this is day 6 and bowels have been normal every day until now. the blood just scared me? not alot maybe a tablespoon. he is fine otherwise. just ate and is running around like normal? thoughts??