Border Collies - Border Collies, known as the workaholics of the dog world, are a lot of work. They need a job to do, whether its herding, agility, flyball, Frisbee championships ... anything to keep their overactive brains busy! If you don't give a Border Collie the physical and mental exercise he needs, he will destroy everything. And I'm not just talking about socks and teddy bears. I'm talking: mattresses, recliners, carpets, and wooden stairs!