▁their ▁gene ▁pool . ▁Hy br ids ▁between ▁dogs ▁and ▁Eth iop ian ▁wol ves ▁discovered ▁in ▁the ▁Eth iop ian ▁High lands ▁likely ▁origin ated ▁from ▁past ▁interactions ▁between ▁free - ro aming ▁fer al ▁dogs ▁and ▁Eth iop ian ▁wol ves ▁living ▁in ▁isolated ▁areas . ▁ ▁Rec ogn ized ▁w olf dog ▁bre eds ▁by ▁the ▁FC I ▁are ▁the ▁Czech oslov ak ian ▁Wolf dog ▁and ▁the ▁S aar lo os ▁Wolf dog . ▁ ▁History ▁Wh ole ▁gen ome ▁sequ encing ▁has ▁been ▁used ▁to ▁study ▁gene ▁flow ▁between ▁wild ▁and ▁domestic ▁species . ▁There ▁is ▁evidence ▁of ▁w ides p read ▁gene - flow ▁from ▁dogs ▁into ▁w olf ▁populations , ▁and ▁very ▁few ▁deliber ate ▁cross ings ▁of ▁wol ves ▁with ▁dogs , ▁such ▁as ▁the ▁S aar lo os ▁Wolf dog . ▁However , ▁the ▁global ▁dog ▁population ▁forms ▁a ▁gen etic ▁cluster ▁with ▁little ▁evidence ▁for ▁gene ▁flow ▁from ▁wol ves ▁into ▁dogs . ▁An cient ▁DNA ▁shows ▁that ▁dogs ▁from ▁Europe ▁over ▁ 5 , 0 0 0 ▁years ▁ago ▁also ▁show ▁little ▁evidence ▁of ▁inter bre eding ▁with ▁wild ▁can ids . ▁ ▁Pre histor ic ▁w olf d ogs ▁A ▁ 1 9 8 2 ▁study ▁of ▁can ine ▁sk ull s ▁from ▁Wy oming ▁d ating ▁back ▁ 1 0 , 0 0 0 ▁years ▁ago ▁identified ▁some ▁that ▁match ▁the ▁morph ology ▁of ▁w olf d ogs . ▁This ▁study ▁was ▁re but ted ▁as ▁not ▁providing ▁convin cing