▁lead ▁he el work ▁at ▁different ▁p aces , ▁distance ▁control , ▁retrieve , ▁send ▁away , ▁stays ▁and ▁sc ent ▁disc rim ination . ▁ ▁The ▁Fly ball ▁competition ▁is ▁a ▁relay - style ▁race . ▁Teams ▁of ▁four ▁dogs ▁comp ete ▁against ▁each ▁other ▁in ▁a ▁knock - out ▁competition . ▁Each ▁dog ▁j umps ▁a ▁series ▁of ▁four ▁hur d les , ▁and ▁then ▁steps ▁on ▁a ▁box , ▁which ▁is ▁rig ged ▁to ▁release ▁a ▁ball . ▁The ▁dog ▁must ▁then ▁return ▁the ▁ball ▁to ▁the ▁start ▁of ▁the ▁course ▁to ▁tag ▁one ▁of ▁its ▁team , ▁who ▁then ▁repe ats ▁this ▁process ▁until ▁all ▁the ▁dogs ▁have ▁finished . ▁Teams ▁must ▁qual ify ▁during ▁the ▁preceding ▁year . ▁ ▁Cru ft s ▁also ▁hold ▁both ▁fre est yle ▁and ▁he el work ▁to ▁music ▁compet itions , ▁consisting ▁of ▁a ▁ch ore ograph ed ▁routine , ▁compr ising ▁elements ▁of ▁ob ed ience , ▁set ▁to ▁music . ▁ ▁The ▁game keep ers ▁classes ▁at ▁Cru ft s ▁focus ▁on ▁jud ging ▁the ▁suit ability ▁of ▁field - bre d ▁dogs ▁for ▁use ▁in ▁the ▁field . ▁D ogs ▁entered ▁are ▁of ▁the ▁g und og ▁group , ▁but ▁the ▁con formation ▁of ▁these ▁dogs ▁diff ers ▁significantly ▁from ▁that ▁of ▁g und ogs ▁from ▁show - bre d ▁blood lines , ▁ow ing ▁to ▁the ▁need ▁for ▁function ▁as ▁a ▁working ▁g und og , ▁and ▁they ▁are ▁jud ged ▁accordingly . ▁ ▁The ▁Young ▁Kenn el