Your Dog's Life - Ages and Stages

Dubbed by experienced dog owners as the "question period" of your dog's life (as in "why on earth did I think I wanted a dog?!") - at approximately eight months to eighteen months, dogs go through a teenage-like rebelliousness. He now has most of his full-size, and an energy-level that has him bouncing off walls and over furniture, and suddenly he seems to testing every boundary you ever set.