Out walking my pup around the block my neighbor mentioned that to me, why does your dog bark in the early am hours. I told her I am up in the early am hours and he needs to go out. I don't leave him out there, and I know he still has his high pitched puppy bark but I work harder now trying to distract him from barking. He just don't seem to be able control himself running out there in the dark barking at whatever bunny happens to have taken an opportunity to invade his territory, I am just hoping one night it isn't a skunk. lol. Some people though, sleep during the day, and that's when her dog is out there barking, I try harder now but sometimes I think people let it escape them the world works on different shifts, not everyone is up during the day and they do things also that awakens people.