I had her checked to see of she was pregnent because she was living with my sister-in-law that had a male shih tzu, her bowels are normal, She seems to be ok now. She is getting a bit more food now then she was. I'm going to get her checked out ths weekend. Thanks for the help.
Hard to tell what may be going on. Could be any number of things. Have you changed her food and what are you feeding? does she have regular bowel movements that are well formed? Does she seem to strain when she goes? Do you see any blood, mucus or worms in her stool? Why would they check to see if she is pregnant? Is there a chance she could be? I take it she is not spay?
Try to go over her from head to foot, slowly, including legs and hips to see if there are any sensitive areas that she favors or might make her yelp.
Other than that it would not hurt to add some canned pumpkin (not the pie filling) to her food and make sure she has adequate fluid intake.
Any chance she got into or ate something?
Wish I could be of more help but if this continues or gets worse, she should probably have a Vet exam