This incredibly intelligent breed of dog requires a lot of mental stimulation. They love to learn and their brains can absorb lots of different tricks. They respond well to the use of treat rewards and other training tools (such as clickers). Interactive toys also help to sustain their mental stimulation (when you aren’t free to train them yourself). Natural herders, Border Collies should be kept on a lead near traffic. Chaser, a Border Collie, is famous for having vocabulary of over 1000 words.