Mother-in-law Dog-sitting Etiqutte

Ok, so we "babysit" for my Mother In Laws dog every other month or so for about 5 days at a time. This time my hubby finally asked her to provide the poor dog with certain necessary vet care but she assumed he asked only because I encouraged him to, because im such a "neat freak" (I dont think it is an unreasonable request!) and her hubby even made a comment about it as they were leaving. I have never said anything about it, I kinda feel like it is hubbys place to do so, and if it were my parents I would be the one to say something.










(Their dog looks a lot like this!)

Anyway, this time around the 40 pound dog crawled up on my daughters bed and urinated on it, down comforter and all. They normally let the dog sleep in bed with them but I put up a babygate to keep it out of our rooms. Apparantly her bedroom door wasnt latched as I thought it was though. So our total bill from the dry cleaners for that was about $40. Here is my question... would it be rude to ask her to pay it? My husband prefers that we just dont mention it at all , but I would prefer to bring it up. Should I just keep quiet about it to keep the peace?