What should I do?

Remember in my last post how I mentioned a dog? Yes, a dog. Her name is Izzy and she has been living with us for about a month now. She belongs(ed) to Traci, my new sister-in-law. Their condo doesn't allow dogs, or it costs some crazy fee to have them and so they offered her to us. It kind of started out as we would watch her while they were on their honeymoon, but if we liked her we could keep her sorta thing. And here's the thing. We probably should have never agreed to it in the first place. I am a dog liker, not a dog lover. Richard is great with any animal and the kids just love her. After the first few days I actually got a few hives on my neck and Richard told the kids that if I was allergic we wouldn't be able to keep her. "No fair!" they said. "C'mon guys, if you had to choose between me and the dog, what would it be?" I said. After a long pause, they said, "ugh...that's a hard one!" We were planning on getting a dog next summer, a dog of our own choosing. But now, even though Jake and Traci would be happy to find a new home for her, I just don't know what to do. My kids love her. She sleeps with them every night. Kate even says her name and it is the cutest thing ever. But I am the one who is home all day and listens to her bark at every freaking person that passes my house. She barks at every piano student and then has to sniff them for 5 minutes and often camps out at their feet during lessons. Even as I am writing this I am pausing to go tell her to SHUT UP! because Kate is asleep for crying out loud! Kate gets into her food and water (and spills it all over the kitchen floor) multiple times a day. Izzy has even pooped in the toy room so many times that I've lost count. I found dirty diapers stashed under my bed that the dog had pulled out of the garbage! So....what do I do? I need advice! The kids really do love her, but I am not really on the bandwagon. Do I get rid of her and have my kids all mad at me for it, or do we keep her and I just deal with it?