Greyhound racing is the sixth most （1 ） p______spectator sport in the United States ． Over the last decade ， a growing number of racers have been （2）______to spend their retirem household pets，once their racing careers are over． Many people hesitate to adopt a retired racing greyhound because they think only very old dogs are （3）ava______．Actually，even champion racers only work until they are about three－and－a half years old．Because greyhounds usually live to be 12 to 15years old，their retirement is much（4）______than their racing careers． People worry that a greyhound will be more（5）______（nerve）and active than other breeds and will need a large （6）sp______to run．These are false impressions．Greyhounds have naturally sweet，mild dispositions，and while they love to run，they are sprinters rather than distance runners and are （7）______（sufficiency）exercised with a few daily laps around a fenced－in backyard． Greyhounds do not make good watchdogs，（8）______they are very good with children， get along well with other dogs（and usually cats as well），and are（9）______（affection）and loyal．They are intelligent，well－behaved dogs，usually housebroken in only a few days．A（10） re______racing greyhound is a wonderful pet for almost anyone．