狗的孩子们都长大了,老伴也去世多年,于是狗决定离开家,到辽阔的世界去。狗先遇到了作弊的猪,帮助猪实现了当明星的愿望。与猪分手后,狗误入一所学校,被熊校长当作新来的代课教师。狗只得将计就计。它教学不拘泥于成法,让孩子们在实践中学习知识,成了最受欢迎的老师。但好景不长,狗冒充老师的事被教育局发现了,警察也来追捕它,幸好有大家的帮助,狗得以逃脱。熊校长 Dog children have grown up, his wife also died for many years, so the dog decided to leave home to the vast world. The dog first encountered cheating pigs, helping the pig achieve his dream of being a star. After breaking up with the pig, the dog strayed into a school and was considered as a new substitute teacher by the bears’ principal. Dogs have to plan to count. It does not rigidly adhere to the teaching of law, let the children learn knowledge in practice, has become the most popular teacher. However, it did not take long for the dog to pretend to be a teacher and was found by the Education Bureau. The police also came to hunt for it. Fortunately, with everyone’s help, the dog escaped. Bear schoolmaster