Nicknamed the Yorkie, this dog is happy and energetic and incredibly lovable. They are very confident in their appearance and devoted to their owners. Although they are considered a lap dog, they will only sit still for so long. Especially as puppies, they love to run and play and are very curious. This breed loves people and craves human companionship. They are generally 8 to 9 inches tall and about 4 to 7 pounds. They have a pretty low-maintenance coat that only needs to be brushed and cut every so often; their coat can be blue and gold, black and gold, blue and tan, or black and tan.