It is not unusual for bullies to pee on any fabric they can. My Frenchie sometimes does that. she won't go all the way outside in the rain. that time I have and acceptable absorbent mat I put down for her to use. I wonder if they're just too lazy to get up and go outside sometimes (I have a doggie door). I know when males mark they don't necessarily empty their bladder but I'm not sure about female marking. I use an enzyme remover in that laundry and they sell it to spray on furniture. It helps by removing the scent that tells the dog it's okay to pee there.