Why does my dog walk around in a circle before he lays down to sleep?  

my dog does that sometimes, too. maybe they're trying to find a good spot?

LOL, two of our three dogs do that. The ones that do sometimes even scratch at the carpet for awhile first. Are they working to make it "fluffier"? I think my smallest does it to "make it cooler". Not real sure. I have a million questions as to why my dogs (and cats) do what they do! They entertain me and make me laugh everyday with their antics.