Yorkshire Terriers, also known as Yorkies, were originally bred as working dogs to chase and kill rodents, particularly rats, in mines and mills throughout northern England in the 19th century. Rat infestations were a big problem in England at that time, and Yorkies were used to skillfully hunt down rats and burrow underground to chase badgers and foxes. They were also used for hunting small game that lived underground, like foxes and badgers. Although Yorkies were initially bred as working dogs, they eventually became popular as companion dogs due to their small size, intelligence, and hypoallergenic coats. Today, Yorkies are known for being protective, curious, and courageous, and they make suitable pets for many homes.