Though small, the Shetland Sheepdog is a natural herder so they love to chase motorised toys around the house. Unfortunately, this herding instinct can also kick in near cars so they should always be kept on a lead when passing road traffic. Shetland Sheepdogs should be put outside when left on their own, but a chic kennel in the garden ensures they don’t feel hard done by. Celebrity owner: Paul McCartney.