You know a dog is pretty damn dumb if it feels the need to protect its territory by barking at a jet plane flying 15,000 feet overhead. I once knew a collie in Connecticut named Trelawny who did that. We’d be sitting around the pool and Trelawny would suddenly sit up when he heard the faint whine of the jet engines, and then he’d stand up and start barking as the jet flew closer and closer.