how do i make my little kitten use the litter tray? He is ok if i lock him in the bathroom ( have to put a little bit of water in the bath otherwise he will poop in there) but the second the door is opened he will jsut poop anywhere.. sometimes he goes back to the tray but most of the time he just poops... it is getting really frustrating and i am ready to find him a new home ( pregnant and 3 kids here make it hard to deal with poop ROFL) he is 12 weeks old... i thought he would have had the hang of it by now