What is a person who is particularly interested in the sport of purebred dogs called?

A person who is particularly interested in the sport of purebred dogs is referred to as a "fancier." This term indicates a dedicated enthusiasm and passion for purebred dogs, often involving participation in dog shows, exhibitions, and related activities. A fancier typically has a deep knowledge of various breeds, their characteristics, and standards, and may become involved in aspects such as training, grooming, and competing.

The other terms relate to different roles within the broader community of dog owners and enthusiasts. A hobbyist may enjoy the companionship of dogs without a specific focus on purebreds or competitive aspects. A handler is someone who presents dogs at shows, often on behalf of a breeder or owner, but may not necessarily have a strong interest in the sport itself. A breeder is focused on producing dogs according to breed standards, often with the aim of improving a breed or selling puppies, but this role doesn’t inherently reflect the broader enthusiasm for the sporting aspect associated with fanciers.