Asalin wannan nau'in ya ɓace a cikin hazo na lokaci, tsakanin almara da hasashen kimiyya masu ban sha'awa. A cewar daya daga cikin tsoho sagas, mai iko, amma ba ma zaɓaɓɓu ba a cikin hanyar druid na dogon lokaci kuma bai yi nasara ba ya nemi ƙaunar yarinya na gidan sarauta. Rasa bege, Muggle wanda ba zai iya kusanci ga kare ba. An ceci gimbiya (ko da yake ta wata hanya ce ta musamman) ta wata mayya-mayya.
Ta kasa warware sihirin, sai ta sami damar ƙara masa wasu sharuɗɗan: yarinyar za ta dawo da siffarta ta mutum bayan ta haihu, kasancewar a cikin siffar kare. Gimbiya ta haifi 'yan kwikwiyo biyu, yaro mai suna Bran da yarinya mai suna Skolann kuma ta sake zama mutum. Kuma 'ya'yanta sun kafa harsashin ginin wolfhounds na Irish, wanda, yana da kamannin canine, suna da zuciya mai laushi, tunanin mutum, da zuriyar sarauta.
Wadannan karnuka ana ambaton su akai-akai a cikin tsohuwar almara na Irish, yawancin sanannun sunaye da abubuwan da suka faru na shekarun jaruntaka suna hade da su. Ayyukan karnuka sun sami ɗaukaka tare da ayyukan shahararrun mayaƙa, waɗanda sukan shiga cikin fadace-fadace tare da su.