There are about 900 breeds of sheep in the world.
A specialty show may be regional or national. A "Best in Show" win at a national specialty show is tremendously prestigious, indicating that the winning dog or bitch triumphed at a contest which attracted entries from the most serious fanciers of that breed in the country or continent. Some specialty shows attract international entries.
The two largest American dog shows after Westminster are the National Dog Show (which is televised on Thanksgiving Day by NBC, usually after the Macy's Thanksgiving Day Parade) and the AKC/Eukanuba National Championship.