Zeke (4) is leery of some loud noises but not all - like no problem with fireworks, but the oven fan scares him. I've also noticed he is very paranoid about traffic - walking through our development if a car is backing out down the road, he will stop and has to watch until they go away. He's also leery of things that don't move...like if we pass a mailbox that has balloons tied to it or a parked RV he will move so that he's on the inside of the sidewalk, away from it. Doesn't seem to be any rhyme or reason to it. I don't see anywhere that it's a boxer thing. We've had him since 8 weeks so I know it's not from anything he experienced; no relative trauma/drama.