In addition to being affectionate housemates, Chihuahuas are smart and quick to learn. They can compete in agility and obedience tests with the same enthusiasm and success as larger dogs. However, they are wayward little dogs. You will be most successful if you can convince them that competing – or just doing what you ask for – is fun. When training Chihuahuas, use positive reinforcement in the form of praise and food. He will not respond to abuse.