We have a Tibetan Spaniel, a breed which has a connection with Shih-Tzus.
Our neighbours also have a male Tibetan Spaniel.
Both Tibbies refused to eat dry food. Yet, our top Tibbie breeder here recommends a dry food called Supercoat.
I solved the problem by mixing a little chicken, rice & vegetables with the dry food. Most times I use some PAL canned chicken casserole as the 'binder' for the dry food. But I sometimes prepare fresh chicken, rice & vegetables, too.
So these 2 Tibbies now eat their dry food happily this way.
By the way, I cook balsamic rice for the dogs...it has a much lower starch content than ordinary rice.
Marie