Shih Tzus should be clipped regularly to keep them cool and comfortable. The simplest cut is known as the "puppy cut" and can be done at home. If you start clipping your Shih Tzu as a puppy, it learns that grooming doesn't hurt.
Brush tangles out of the dog's coat
Place your dog on a non-slip surface. Brush his coat thoroughly so as to remove all tangles and mats from his fur.
Clip around sensitive areas
Chose a high-numbered clipper blade such as a number 10 or 15. Use this blade to clip around sensitive areas such as the face, ears, anus and genitals. Use round-tipped scissors to complete the clipping if the dog is sensitive to the clipper.
Trim the remainder of the dog's coat
Use a number 2 blade to give the dog's coat a general trim. Clip in the direction in which the hair grows, leaving 1 to 2 inches of fur behind.