▁the ▁necessity ▁to ▁develop ▁certain ▁physical ▁characteristics ▁to ▁perform ▁a ▁certain ▁type ▁of ▁work . ▁Thus , ▁powerful ▁but ▁ref ined ▁bre eds ▁such ▁as ▁the ▁And alus ian ▁or ▁the ▁L us it ano ▁developed ▁in ▁the ▁I ber ian ▁pen ins ula ▁as ▁r iding ▁horses ▁that ▁also ▁had ▁a ▁great ▁apt itude ▁for ▁dress age , ▁while ▁heavy ▁draft ▁horses ▁such ▁as ▁the ▁C ly des dale ▁and ▁the ▁Sh ire ▁developed ▁out ▁of ▁a ▁need ▁to ▁perform ▁demand ing ▁farm ▁work ▁and ▁pull ▁heavy ▁w ag ons . ▁Pon ies ▁of ▁all ▁bre eds ▁originally ▁developed ▁mainly ▁from ▁the ▁need ▁for ▁a ▁working ▁animal ▁that ▁could ▁ful fill ▁specific ▁local ▁draft ▁and ▁transport ation ▁needs ▁while ▁surv iving ▁in ▁har sh ▁environments . ▁However , ▁by ▁the ▁ 2 0 th ▁century , ▁many ▁p ony ▁bre eds ▁had ▁Arab ian ▁and ▁other ▁blood ▁added ▁to ▁make ▁a ▁more ▁ref ined ▁p ony ▁suitable ▁for ▁r iding . ▁Other ▁horse ▁bre eds ▁developed ▁specifically ▁for ▁light ▁agricult ural ▁work , ▁heavy ▁and ▁light ▁carriage ▁and ▁road ▁work , ▁various ▁e quest rian ▁discipl ines , ▁or ▁simply ▁as ▁p ets . ▁ ▁P ure bre ds ▁and ▁reg ist ries ▁ ▁H ors es ▁have ▁been ▁select ively ▁b red ▁since ▁their ▁domestic ation . ▁Today , ▁ ▁over ▁ 3 0 0 ▁bre eds ▁of ▁horses ▁are ▁known ▁in ▁the ▁world . ▁However , ▁the ▁concept ▁of ▁pure bre d ▁blood stock ▁and ▁a ▁controlled , ▁written ▁bre