Dog fighting is a type of blood sport that turns game and fighting dogs against each other in a physical fight, often to the death, for the purposes of gambling or entertainment to the spectators.[1] In rural areas, fights are often staged in barns or outdoor pits; in urban areas, fights are often staged in garages, basements, warehouses, alleyways, abandoned buildings, neighborhood playgrounds, or in the streets.[2][3] Dog fights usually last until one dog is declared a winner, which occurs when one dog fails to scratch, dies, or jumps out of the pit.[4] Sometimes dog fights end without declaring a winner; for instance, the dog's owner may call off the fight.[4]

https://en.wikipedia.org/wiki/Dog_fighting