We know the continental Celts kept a greyhound probably descended from the greyhound first depicted in Egyptian paintings. Like their continental cousins, the Irish Celts were interested in breeding large hounds. These large Irish hounds could have had smooth or rough coats, but in later times, the rough coat predominated possibly because of the Irish climate. The first written account of these dogs was by a Roman Consul 391 A.D. but they were already established in Ireland in the first century A.D. when Setanta changed his name to Cu-Chulainn (the hound of Culann). Mention is made of the Uisneach (1st century) taking 150 hounds with them in their flight to Scotland. Irish hounds undoubtedly formed the basis of the Scottish Deerhound. Pairs of Irish hounds were prized as gifts by the Royal houses of Europe, Scandinavia and elsewhere from the Middle ages to the 17th century. They were sent to England, Spain, France, Sweden, Denmark, Persia, India and Poland. In the15th century each county in Ireland was required to keep 24 wolfdogs to protect farmers' flocks from the ravages of wolves. The Cromwellian prohibition (1652) on the export of Wolfhounds helped preserve their number for a time but the gradual disappearance of the wolf and continued demand abroad reduced their numbers almost to the point of extinction by the end of the 17th century.
The revival of interest in the breed accompanied the growth of Irish nationalism in the late 19th century. The Irish Wolfhound became a living symbol of Irish culture and of the Celtic past. At this time, one determined enthusiast, Capt. G A Graham, set about obtaining some of the few remaining hounds of the Wolfhound type that could still be found in Ireland, and with the use of Deerhound blood and the occasional outcross of Borzoi and Great Dane, he eventually achieved a type of dog that bred true in every generation. The results were ultimately accepted as a legitimate revival of the breed. The
Irish Kennel Club scheduled a class for Irish Wolfhounds at their show in April 1879, and a club was formed in 1885. The Irish Wolfhound now enjoys once again something of the reputation that it had in the Middle Ages. Wolfhounds are now owned and bred in fairly large numbers outside of Ireland.