The Yorkshire Terrier is a small dog breed of terrier type, developed during the 19th century in Yorkshire, England. Ideally, its maximum size is 7 pounds (3.2 kg). A popular companion dog, the Yorkshire Terrier has also been part of the development of other breeds, such as the Australian Silky Terrier. It has a grey, black and tan coat, and the breed's nickname is Yorkie. The ideal Yorkshire Terrier character or "personality" is described with a "carriage very upright feisty" and "conveying an important air". Though small, the Yorkshire Terrier is active, very overprotective, curious and fond of attention. Mentally sound and emotionally secure ones should normally not show the soft submissive temperament seen in lap dogs although many exhibit this behavior due to improper training. Because of this, it is advised that a Yorkie would not be suitable for a home with typical young children. Instead, they make ideal companions for older families with many more reputable breeders routinely only homing to families with children older than about 10 years for the comfort of the dog, but more so for the benefit of the child.