He diligently watches the front and back doors, especially if I'm in the shower or sleeping during the day after a long trek home. He does it when we're at a friends house.
That being said, from my front porch, if one looks in the big picture window to see if someone is home, you can look directly into the main bathroom, which for some reason the builders put right off the living room in a little hall at the perfect angle to wave at guests. I'm always careful to keep the door closed, even when home alone.
I'm in there, uh. . ."defueling" after the giant Bucket o' Brain Freeze after range time, when from the living room comes that bark I know so well. It's different than the "it's a squirrel bark, bark bark bark!" or the short sycophantic little bark that says "I miss you pay attention to me". It's the "I see someone outside" bark. It''s daylight on a Saturday , the cop next door is tinkering on his truck with the squad car parked in front of my curb, I'm not concerned.
But Barkley is.
There's a scratch and a soft whine at the bathroom door. Look Barkley, it's either the neighbor kids selling candles for the school fundraiser they do every fall, your arch enemy the UPS guy (don't bark - he's bringing us reloading stuff!) or the plumber working at the other neighbors.
Not to be confused with Abrahan Lincoln, Vampire Hunter.
But I'm not in a position to come on out so he'll quit barking.
"Barkley, hold on, I'm. . .not. . dang!" Scratch scratch scratch.
Finally with is a big determined PUSH on the door with a black snout, the latch gives way and the door pops completely open in full view of the front window.
"bark bark - Mom there's people here!"
Those two Mormon kids on their bikes probably won't be back. . .