Hi
Just wondering, did you try a new bag of food when you were reintroducing the food?
Maybe the bag was bad.
Mickey (Yorkie) loves the Acana food. Especially fish flavor.
The pieces are bigger if that is a problem.
Max (Morkie) is more sensitive and eats Natural Balance Potato and Duck.
The Natural Balance Limited ingredient foods are usually good for sensitive tummys. It helped with Max.