A.G.
I had the same problem with my son. I don't know if this will work for you but I told my son if he started pooping on the potty, we would go buy the toy he had been asking for over the last several weeks. It worked and only cost me a $15 toy. Much cheaper than having to keep buying pull-ups! He didn't keep asking for more toys either, which was a fear. Worth a try. Good luck.