Milk but he's a mask-wearing wolf (Thanks Wallhammer

I’m fairly confident most Disney characters are unfamiliar with firearms.

They are unaware that they can be shot in the head

I'm pretty damn sure that most Disney characters, hell, even LGBT characters are extremely unfamiliar with firearms and how devastating they are.
Arthur could definitely take down lots of them in a fight. Hell, you don't even have to be Arthur to take them down. You could probably be a f**king gun Spy in TF2 and kill like half of them