For me, it is several things.
The biggest one is the peeing bit. Even if girls dribble a little pee pee here and there, it is one thing to get a little off your floor, it is another to have it soaked into the side of your sofa
. The other part is that I have two sons. I wanted a girl, and I gave it two tries. So my girl dog is the daughter I never had. I get to put dresses on her, bows in her hair, and just enjoy the fact that she's a girl.