1,800 of the nation's top dogs spanning over 190 breeds vie to be named Best in Show at the annual event hosted by John O'Hurley and David Frei, with additional insights from Mary Carillo. Hosted by the Kennel Club of Philadelphia and sanctioned by the American Kennel Club (AKC), this annual celebration of dogdom dates back to 1879. The competition includes breed and group judging, culminating in the Best in Show finale during which one of seven group-winning dogs will be chosen and celebrated as the winner.