Yeah, in fact, Steven Jay Gould wrote a great article on how "As Mickey became increasingly well behaved over the years, his appearance became more youthful. Measurements of three stages in his development revealed a larger relative head size, larger eyes, and an enlarged cranium--all traits of juvenility." As he puts it, "Humans feel affection for animals with juvenile features."

full article: http://www.monmsci.net/~kbaldwin/mickey.pdf