If we're talking angle of entry…for humans draw a line in the direction of their torso then rotate it about 30 degrees away from the anus. For horses it's basically directly in line with their torso. As far as entry location, it should be just under the anus for humans or horses.So on both accounts this would technically be wrong, but you're right there's no "wrong" with fictional characters. Either way I'd agree with BG pony that it's too close to the stomach since location is fairly consistent among most mammals, so I figure fictional is no different.However, in this instance it's not really bothersome at all, and I'm a stickler for "correct" anatomy and I still find this image delightful.