help! my new kitten won't poop in her litter box. on the first day i got her, she used the box without problem, but now she always poops next to the box. i have experimented with getting her bigger litter boxes, uncovered ones, and covered ones. i have also experimented with different levels of litter in the box. once i even caught her just before she was going to poop outside the box and i placed her in the box just in time. she still didn't learn to use her box. so this is my problem, please help!