Today's Yorkshire Terrier is a far different dog than when the breed appeared in 1865. In over just one hundred years, the size has been greatly reduced from an average weight of thirty pounds to a mere seven pounds today. And the trend is to have the Yorkie (as the breed is affectionately called) get even smaller, with adults tipping the scales at a mere three pounds. But who knows? Perhaps in the future, there will be a demand for the Yorkshire Terrier to grow back into a thirty pound dog.
Like many breeds of dogs, the name does not reflect their point of origin. For example, German Shepherds were actually developed in France. And Australian Shepherds originated in America. The geographical difference isn't nearly so big, but it is still significant. The main stock for today's delicate, adorable and pampered Yorkshire Terrier came from the unforgiving landscape of Scotland.
The ancestors from Scotland were called, appropriately enough, the Scottish Terrier and the Clydesdale (or Clyde) Terrier (which is now an extinct breed). It is thought the also extinct Scottish breed the Paisley Terrier made a significant genetic contribution to the origins of today's Yorkshire Terrier. Scottish weavers became suddenly unemployed during the Industrial Revolution and moved south to the rough English county of Yorkshire in order to find work. They brought all of their families with them – including their dogs.

The Scottish dogs then inevitably wooed the blushing English roses of the local canine population. It is thought those breeds were the Black and Tan English Terrier (also now extinct), the Skye Terrier and the Waterside Terrier (which is – you guessed it – also extinct). According to the majority of Yorkshire Terrier information sources, the founding father of the breed, Huddersfield Ben, was born in Yorkshire in 1865. He became one of the most admired dogs of his day.
As time went on, the need for big working dogs decreased. People were living in smaller homes and needed smaller dogs they could physically control easily. The Yorkshire Terrier filled this niche admirably. They were a hit on both sides of the Atlantic. Not only did they make great guard dogs, but were affectionate and did not need a lot of exercise. They were introduced to America in 1872.

Over the last century, Yorkshire Terriers have become ever smaller. The original Yorkies were about thirty pounds and came in several colors. Today's show Yorkies are not to exceed seven pounds and must be steel blue and tan (and have those colors in specific proportions). The hot trend is top breed Yorkies that tip the scales at three pounds, which has lead to concerns about the health of breeding such small dogs. The Yorkshire Terrier, as of 2006, is the second most popular purebred dog in America.

The Yorkshire Terrier was a much larger breed in the beginning. Many books that include large sections on Yorkshire Terrier information can be found at the library.