AITA for telling my friend she can't bring her emotional support dog to my wedding

This is my fiance's account cause its a little too personal and I dont know how to word it without giving away who i am. I asked my fiance to help me out with this chambers post.<br><br>My sister (F26) graduated law school and was looking for a way to celebrate. I (F25) am getting married this summer and my sister is going to be my maid of honor. We started talking about the fact that im going to be away for our wedding weekend and she was looking for a way to celebrate just the two of us. <br><br>She showed me a couple of websites for honeymoon cruises and after looking through a few we found a couple that we both really liked. She had budgeted well for law school and had saved up pretty well. I on the other hand had spent all of my savings on wedding expenses and have about 10k worth of student loans that i am hopefully going to pay back through my internship this summer. I really wanted to go on a more expensive cruise, but my sister was really excited about the budget ones so i listened to her and we ended up deciding on one of the more affordable options. <br><br>She suggested the two of us leave our fiance's well we were there and see if we could convince him to bring us to nicer ports. (Both of our fiance's knew we were talking about this so it wasn't a secret). We looked up the ports and we are all super excited about the trip. <br><br>My friend (F26) saw the website for the cruise that my sister used and asked me if i knew of any cheap hotels in our city that week because she was looking for a place to stay with her dog. I told her no and then asked why her dog was staying somewhere else. She wants to bring him to the wedding and I told her no. AITH?