Horse breed been produced. Such restrictions have led to legal challenges in the United States, sometime based on state law and sometimes based on antitrust laws. Horses can crossbreed with other equine species to produce hybrids. These hybrid types are not breeds, but they resemble breeds in that crosses between certain horse breeds and other equine species produce characteristic offspring. The most common hybrid is the mule, a cross between a "jack" (male donkey) and a mare. A related hybrid, the hinny, is a cross between a stallion and a jenny (female donkey). Most other hybrids involve the zebra (see Zebroid). With
Peter the Great (horse) white star on his forehead and on the left hind leg a white sock. Peter the Great established the American Standardbred bloodline through the Hambletonian 10 offspring Happy Medium. During his life, Peter the Great covered thousands of mares. His tail-male pedigree was Pilot Medium/Happy Medium/Hambletonian. His tail-female pedigree was Santos by Grand Sentinel/Swallow by Joe Hooker/Dixie by Sam Johnson's horse/Dam by Cumberland. Peter the Great (horse) Peter The Great (1895–1923) was an American Standardbred horse. A descendant of Hambletonian 10, he is considered one of the most important sires in the development of the modern Standardbred breed. Peter the