Collies are repeatedly listed one of the most intelligent dog breeds in the world. Happy has previously displayed remarkable discipline and patience at the request of her owner. Her YouTube channel shows her flipping treats, fetching discs and resisting a bunch of sausages draped all over her furry little face. Here, we see her learning how to balance a glass of water on her head as her owner fills it to the brim. Credit: YouTube/iSh4dy
