What food would you recommend for a dog who has a sensitive stomach? He's a 6 1/2 month old Siberian Husky. He gets diarrhea very easily and drinks excessively (to the point he makes himself sick). We've taken him to the vet to rule out any medical issues going on and I believe it's diet related. He's on Gravy Train currently out of desperation as it's the only thing he's done decently on. He's been on Kibbles 'n Bits (vet rec. which is why I'm on here instead), Pure Balance and Blue Buffalo in the past. He also can't have any treats due to it triggering it bad. When this happens he'll poo and pee in his crate and generally act like he just don't feel good. Any help would be greatly appreciated. Thank you.