I also use a chainspot for a dog to empty. Recently, a certain dog I'd been keeping inside got thrown off his "schedule" due to being inside as all the laying around in the crate changed his BM habits to some odd schedule. What I've had to do is leave him outside for the previous 5 days for him to get back to his normal routine. Dogs are weird, and the best thing to do is to be flexible when their weirdness arises.