I'm sorry that your fur baby wasn't feeling too good and I sure hope he doesn't get it again. Shih Tzus do get problems like that. I had a cross shih tzu cockersp. and if I gave her something from the table it would affect her. I had to rush her to the vets different times even if I didn't feed her people food. They say dogs aren't suppose to sweat well I knew when she was going to be sick. There was this smell that started from the top of her head and then it would go all thru her , she would get real sick lay down and get up and alot of times she would be alright after a bit. Her bowels would give her a problem. Vets bills were something else but you don't care because they are your babies and part of the family. She lived to the age of 14. I miss her very much she was our best trucking buddy. I sure hope your little one is on the way of feeling better.