How to train a Pug?

Start training a Pug at about 3 months, when habits form and the brain is developed. Go from easy to hard, beginning with housebreaking, sit, down and shake, using clear commands and rewards. For sit, hold food to draw attention, say sit, and when it sits, reward; if not, raise the food above its head to force a sit, then reward. After repeats it learns the command.