We have a Yorkie/Shih Tzu mix dog (1 year old) who has been having diarrhea for the past 3 days. She appears very depressed and isolates herself. She has been dragging her butt and her anus is red and inflamed. The diarrhea is about the color of golden brown sugar and has the consistency of pudding. We have withheld her regular food and given her beef and rice at the suggestion of the pet store. Does anyone have any advice? Is this an emergency?