Someone once asked...
Someone answered with kindness...
It's not there cut by themself. It's a race human fully evolved from wolves. Humans and 'dogs' evolved together and dogs were selected by reproduction on features that please humans: esthetics, strength, ... but above all character!
Another soul answered...
Scientifically speaking, cuteness in other species can be explained by neoteny, a ser of traits related to the preservation of juvenile physical characteristics and behavior across adulthood, which include larger eyes, rounder faces and a playful character, which implicitly resemble human infants. Woof.