I thought I would ask on behalf of a friend who has a German Shepard cross what can help with a fussy eater who will also go a day or two without eating and then when eats has mostly loose/runny poo. He has tried arrow root which does work sometimes. The dog is on a raw diet so nothing processed. Dog seems well in himself, full of energy and weight is not a problem. I understand the breed can be prone to digestive issues but wondered if there is anything else to be tried?