A designer dog is a term used to describe a hybrid or mixed breed dog that has been intentionally bred by crossing two purebred dogs from different breeds. The goal of these cross-breeding efforts is often to create a new breed with desirable traits from both parent breeds, such as combining the intelligence and trainability of one breed with the physical characteristics or size of another. Designer dog breeds are not recognized by kennel clubs and do not have standardized appearance or temperament guidelines like purebred dogs.