Are these potty walks? Or does he potty normally at home and then have diarrhea on the walk. If he is having a normal stool at home, but having diarrhea on walks, this is a stress/excitement issue. Giving him more fiber in his diet may help, and getting a little older and more confident may help, but some dogs have this for life. It’s because their anxiety level causes adrenalin to flood the system. Adrenalin speeds up the large intestine’s motility, so they have to go before the large intestine has had a chance to reabsorb all the fluid in the stool. The added fiber helps to regulate the speed that things pass through the large intestine.
