Body language. The dog is reasoning out his manuver, Where should I lie down, am I ready to lie down, is this the right spot? "OK, I'll try it". They smell their poop, or someone elses to find out who it belongs to, "Ok, I did this", "Sam's been here", "what have they been feeding me?" If more people truly understood animals, they would find out that they really do talk. They understand us more than we do them. So who is the stupid animal?