Hi,
I figured I would IM you. When it comes to food everyone will give you a different opinion. I suspect since they had him on a salmon based kibble, he may have had some sort of food intolerance. I like using science diet for these types of situations. They employ an army of animal nutritionists and vets. You could try their sensitive stomach and skin food. They also make prescription foods but those you need to get through a vet and are costly.
I figured I would IM you. When it comes to food everyone will give you a different opinion. I suspect since they had him on a salmon based kibble, he may have had some sort of food intolerance. I like using science diet for these types of situations. They employ an army of animal nutritionists and vets. You could try their sensitive stomach and skin food. They also make prescription foods but those you need to get through a vet and are costly.