User blog comment:Hidden Scorpius XI/D-Piddy attacked by a Zwei cosplayer at Anime Expo 2015./@comment-25555436-20150711172511/@comment-26018514-20150712073039

As Chishio said... also, dogs tend to read intent/posture and be protective of their owners... I would likely attribute this incident as the dog misreading the threatening posture... which is definitely what Little Mac uses.... a boxing stance that is by default aggressive.

A cat would be far worse, but cats are generally self centered dicks and wouldn't respond to the posture in the first place, because they really don't give many shits about their owners except as a source of food.