The Irish Wolfhound (Irish: Cú Faoil, Irish pronunciation: (ˈkuː ˈfˠiːlʲ)) is a breed of domestic dog (Canis lupus familiaris), specifically a sighthound. The name originates from its purpose (wolf hunting with dogs) rather than from its appearance. The breed was originally developed for use as war hounds as well as hunting and guarding its owners homes but over time it changed roles to become a modern day family pet. Irish Wolfhounds can be an imposing sight due to their formidable size; they are the tallest of all dog breeds.