has anyone tried the second nature litter box for dogs? the web site purina has fir confessions of a pooper are great, i bought the program yesterday but not having much luck yet. i freaked out the other day when chewie slipped under the fence when i let him out, i don't want to chance losing him, he won't come when i call him. he thinks it's a game and races around the house, very funny for him frustrating for me.
