I have had my puppy for about 2 months now and we are trying to crate train him,which seems to be a difficult task. We don't keep him in the crate longer than 5 hrs at a time. We walk him first thing in the morning and before we put him up at night but it seems like less than 5 minutes after we put him up he's pooping in his crate. WHAT AM I DOING WRONG!