A.G.
Same thing with my older son. Only pooped in his underwear for almost 6 months. I took him to the store and let him get the toy. I then duct taped it to the top of the toilet. Once he knew the toy was in the house he at least tried. I am also lucky enough that he loves prunes. Once we had the toy I let him have three prunes a day for a while so that he would go. Good luck to you-I know it is hard to keep cleaning up the yuck, but "this too shall pass".