We recently started feeding our 6 month old miniature Australian shepherd the honest kitchen grain free beef dehydrated food. Our vet thought he may be allergic to chicken as he kept having loose, light colored stools and recommended trying something with beef. As soon as I made the switch his stools firmed up, however they are DARK, and almost green colored. Is this related to the fact that it is such a rich formula, and has so many greens in it anyway? He is acting totally fine on the food, tons of energy and LOVES the food. Just wondering if this has happened to anyone else.