as Amy said, Alaskan Huskies are mixes of several breeds (husky, shepherd, greyhound, pointer, lab, akita, etc), bred for strenght, endurance, speed, etc. so maybe this particular dog has some greyhound, lab, husky, etc. in him and Nala might have some of them as well, either way i found it cute and they would be a perfect match

edit: i just say Kay´s post, i know Nala is taken, but aint he like her twin bro