I ran into the same issue with Mr.Beefy but with lamb. It could be that he has a sensitivity to the chicken. I hate to say that but it could be VERY likely. How many stools and what consistency were they before the chicken? I have found with Mr.Beefy(not true for all bullies) that he ilamb sensitive and if I only give him 1/4 cup of veggie he is ok. Now i do give him more brocolli but thats because the fiber is good for his stool(firmer stool).