Do you leave her food out for her all day or just put it down at mealtimes? I've read and heard that you should put their food down at meal times for no more than 15 minutes. If they don't eat, they don't eat! I used to have a dog(ironically, also a shih-tzu) that we left the food down all day for and he wouldn't touch it! ( I think my Mom was slipping him too much people food! Could that be the situation in your home?) BUT, when we went to bed at night, he would sneak out to the kitchen and you could hear him eating. We called him the "closet eater." Have you tried feeding her from your hand? Maybe if you tried no treats for a few days...I'm not too sure myself but I'm sure there are others on this board who will have a better answer. If she's been a poor eater for two months, what is her behavior like otherwise? Is she losing/not gaining weight? Any diarrhea? Does she sleep more than normal for a pup her size? Maybe reactions to her shots? Any changes in your lifestyle or other pets that may have her stressed? OK enough questions...I'll check back for an update...