Rat Terriers are small, energetic dogs with smooth coats, erect ears, and a strong prey drive. They are intelligent, friendly, and known for their agility. Originally bred for pest control, they thrive in active environments and enjoy digging and playing.

The Rat Terrier is a breed that originated in the United States. It was developed through the crossbreeding of several breeds, including Fox Terriers, Bull Terriers, and Manchester Terriers, among others. Therefore, it does not have a natural 'wild' native region as it is a domesticated breed specifically bred in the U.S.

Rat Terriers are highly adaptable dogs and can thrive in a variety of environmental conditions. They are typically found in human-dominated environments such as homes and farms. They are well-suited to both rural and urban settings, provided they receive adequate exercise and mental stimulation.

As a domesticated breed, the Rat Terrier's ecological niche is primarily as a companion animal and working dog. Historically, they were used for hunting and controlling vermin, which reflects their high energy levels and keen hunting instincts. In modern times, they excel in roles as family pets due to their intelligence and agility.