Consistency, repetition and respect are the keys to training a Shih Tzu. Shih Tzus, like any other dogs, must learn to respect their owner as the pack leader. Use both positive and negative reinforcement to acquire balanced behavior.
A Shih Tzu learns through consistency. A dog owner needs to be consistent with both positive and negative reinforcement. If the dog is punished for getting on the furniture one day, it is important not to allow it to get on the furniture another day. Training a puppy is often derailed by a lack of consistency. The dog is unsure what it is allowed to do.
Repetition is also important in training a Shih Tzu. Dogs learn by repetition, and by consistently rewarding good behavior and punishing bad behavior, the dog eventually learns what she is supposed to do. It is important not to punish the dog in a harsh way, but rather in a firm way, so that it learns when you are unhappy with its behavior.
Respect is the other important aspect of training a Shih Tzu. Dogs that do not respect their owners are unlikely to pay much attention to training. Dogs only want to please those they consider leaders. Teach your dog respect by taking control.