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
When a white horse is not a horse When a white horse is not a horse When A White Horse Is Not A Horse (), also known as the White Horse Dialogue (), is a famous paradox in Chinese philosophy. Gongsun Long wrote this circa 300 BC dialectic analysis of the question 'Is "white horse not horse" permissibly assertible?'. The White Horse Dialogue ("Baima Lun") constitutes chapter 2 of the eponymous "Gongsun Longzi" "Master Gongsun Long", who was counted among the "School of Names" (aka "Logicians" or "Dialecticians") in the Hundred Schools of Thought. Most of Gongsun's writings have been lost and the received "Gongsun Longzi" text only