The Ratshire Terrier is a small, energetic dog known for its agility and lively nature. It has a smooth coat, typically a mix of brown, black, and white, and a keen hunting instinct. This breed thrives in active environments and is known for its loyalty and intelligence.

The Ratshire Terrier is not a recognized scientific or common name for a species, but it is often used to describe a crossbreed between the Rat Terrier and the Yorkshire Terrier, which are both domesticated dog breeds. Consequently, the 'native region' refers to the origins of these two breeds. The Rat Terrier originated in the United States, while the Yorkshire Terrier originated in England.

As domesticated dogs, both Rat Terriers and Yorkshire Terriers are highly adaptable and can thrive in a variety of environments provided by human care. Typically, they are kept in homes and are not restricted by natural environmental conditions.

These breeds, and thus their crossbreed the Ratshire Terrier, fulfill the role of companion animals in human societies. They are not reliant on specific natural habitats and instead adapt to the living conditions provided by their human owners.