I think I would definately say something to her. For one you dont need your carpets ruined,second if you went to the trouble of training your own dog not to do this why should you have to put up with it from your cousins dog. It can be done in a nice but firm manner, and heck if she doesnt do something about it yo can always put dog doo doo in her bed lmao lmao. just kidding really I was
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sue