Every dog has a distinct personality based on its breed. With over 150 breeds to choose from, doing your research is essential to finding the right breed for your lifestyle and a lifetime of happiness! The various dog groups are broad categories of dogs based on function, work, and other qualities, qualities that are based on ancestral forms from which modern dog breeds have been derived.
Today, dog breeds are often categorized by the ancestral type and subtype from which the breed descended. In addition, dog breed groups are based on types such as hound or terrier. Some group categories cover more than one type; working dog refers to dogs that do some sort of work for humans, in contrast to non-sporting dogs that are pets, although working dogs can also be companions, and non-sporting dogs can do useful work. The terminology is unclear. For example, the American Kennel Club has a category called Working Group, whereas The Kennel Club of the United Kingdom combines similar dogs in their Utility Group. The Toy Group dogs are very small dogs of any type. Ancient dog breeds are modern breeds genetically identified as descending from very old types of various kinds, and would fit into multiple categories.