I think Dolce does that too...it seems she doesnt like to poop in her playpen...she has no problem peeing in there (on the wee wee pad of course), but when I come home from work I have never found poop on it...except maybe once. As soon as I take her out though, she runs to the pad in the living room or den and poops on there. She also has a hard time getting it out when she is trying to go....but its not all the time. If your pup is having a problem every time she tries to go....I would agree with everyone else and bring her to the vet. Maybe her diet needs to be changed. Good luck and let us know how she is doing!!