A well-groomed Shih Tzu is not just more adorable, but it's also healthier. Dogs or puppies that aren't kept clean and hygenic will be vulnerable to a wide range of ailments, including infections. Grooming also makes a dog feel loved and cared for, something all Shih Tzus love. Dogs that don't feel loved can be depressed, broody and may not take on negative behaviors. It is thus necessary to groom your dog with regularity, and that starts with washing or bathing your dog regularly.