Border collies have a very high energy level and require more exercise and stimulation than most other dogs. They are considered one of the smartest dog breeds of all, if not the smartest.
Their high energy makes them playful and attention seeking. They may chew, dig, or engage in other destructive behaviors if they grow bored due to lack of physical and mental activity. They require lots of play time, either with people or other dogs.
Their intelligence makes them very trainable, as long as the trainer is patient and consistent.