She was only 4 years old and apparently had only one fully formed kidney. She had two litters of puppies and no problems but we had a power outage and it was very hot. I think she got too dehydrated and couldn't come back. Now I'm worried my dogs might have something like that. Of course, I can't stand the heat and I am never without them so when the power went out, they went to the hotel too. Calling the Shih Tzu expert (can't remember her name). Is the kidney thing a Shih Tzu problem?