Mary Allen
#4 Lokacin tseren zinare (1896-1899) yana ɗaya daga cikin lokuta mafi mahimmanci a tarihin irin.
A wancan zamani, a zahiri an kawar da nau'in nau'in: Malamutes ba tare da tunani ba an ketare karnuka da ƙanana da sauri don tseren tsere, da kuma manyan karnuka masu tsauri don yaƙin kare da gasar sarrafa kaya. A shekara ta 1918, waɗannan karnukan sled na Arctic duk sun ɓace.
#5 Wani labari da ya faru a cikin Janairu 1925 a Alaska kuma ya zama sananne a Amurka ya ba da gudummawa ga jawo hankali ga irin.
A lokacin hunturu a birnin Nome, an sami barkewar cutar diphtheria, kayan alluran rigakafi sun ƙare, yanayin yanayi ya sa ba a iya isar da allurar ta jirgin sama. Isar da saƙon yau da kullun zai ɗauki makonni biyu, kuma an yanke shawarar tsara tseren tseren kare daga Nenana zuwa Rum. An rufe nisan mil 674 (kilomita 1,084.7) a cikin sa'o'i 127.5 yayin da karnuka ke tafiya cikin sauri mafi sauri a cikin guguwar Alaska da kuma yanayin zafi da ke ƙasa da daskarewa.
