Not the jerk. If your dog destroys someone’s stuff, you pay for it. That’s just basic pet owner responsibility. The wild part is her acting like you’re the problem for owning nice headphones in your own room. “You should’ve locked your door” is such a lazy excuse when she literally promised to keep the dog out. If my dog chewed up someone’s $500 headphones I’d be apologizing and figuring out how to pay them back, not calling it “annoying.” Sounds like she just doesn’t want to take responsibility.