I dunno its mostly about femenine and masculine traits to make them look one gender or the other. Males usually have more distinct eyebrows and thicker muzzles. but it really depends on the species of animal aswell, xD not quite sure.
BURGER! Noe sier meg at du liker burgere, aye? Anyhow... I love this character! I could stay here all night saying how unique your art style is, but then this comment maay would be too long. xD So cute! The tails re amazing, and the bandana-hat-thing c: