We have had our miniature Schauzer-Poodle cross since November of 2015, He will be two in February of 2017. Recently he has started pooping in the house. He had done fairly well with going outside, but something's up. He knows to ring the jingle bells on the back door knob when he wants out. He will ask to go out, then play and play and then come in and poop. Or not. Sometimes he takes care of his business outside. He did much better than this when we first got him. I am at a loss as to what we are doing wrong. Any ideas?