Rafeiro do Alentejo Dog Believed to be descendants of Tibetan Mastiffs, the Rafeiro do Alentejo was used to guard and move cattle and sheep. They were also used to guard farms, homes, and estates. This breed is still a working breed in Portugal.

Rat Terrier Dog The Rat Terrier was originally named by none other than Teddy Roosevelt. The Rat Terriers were developed in Great Britain from a cross between the Smooth Fox Terriers and the Manchester Terriers in 1820.

Redbone Coonhound Dog The Redbone Coonhound is a strong hunter who enjoys being active, but is content when there is quiet time. They are great with families, but might not blend well with smaller pets.

Rhodesian Ridgeback Dog The Rhodesian Ridgeback is a fantastic watchdog and protector. If trained well as a puppy, they can grow to become great family dogs.

Rottweiler Dog The Rottweiler is known for its superior protection and watchdog abilities. They have a tendency to be overprotective if they themselves, or their owners, feel threatened.

Russian Wolfhound Dog Also referred to as the Borzoi, this breed was bred by Russian aristocracy during the 17th century. This elegant sight hound excelled in, and were prized for, their bravery and fierceness in wolf hunting.