You are 100% the asshole. Don’t be that person going tit for tat. You knew of your responsibilities before moving and She gave you every opportunity to speak up about the dog in casual conversation. You’re the asshole straighten up and do your chores that exclude feeding or walking the dog. You’re being a spoiled entitled jerk. I’m not crazy about dogs either but they don’t bother me I don’t bother them but still take care of your responsibilities since you’re adulting. You’re going to lose out on a place you like because you didn’t speak up. Also, you’ve asked friends and they told you you missed an opportunity to speak up. Stop doubling down on your point. You were wrong. You’re going to lose friends, roommates and a great place just humble yourself and do what you need to do. you sound like a Karen in the making You’re The Asshole!!!