Training and intelligence
You won't get far trying to bully this a Shih Tzu. They are intelligent, and gentle, reward based training will persuade this breed best. Although they are friendly, they can have a tendency to be stubborn.
Temperament
Shih Tzu's are very people orientated dogs. They are generally affectionate and relaxed. They are cheerful and playful, and thirve on interaction with people.
Attitude towards strange dogs and people
Everyone is a friend to a Shih Tzu. They are sociable, happy dogs, and they love to meet people. They are not aggressive towards other dogs, and have no real guarding instincts.
Grooming and shedding
Unless the coat is clipped, it is high maintenance. Shih Tzus don't shed much.
Exercise
Shih Tzus are very active and have considerable amounts of energy. Some of their energy can be used up by playing.
Need for company
Shih Tzus love to be with their people, and can be destructive if left alone too long.
General
Daily routine with a Shih Tzu should include cleaning the eyes. With the right care they should enjoy a long life.