got older, he had a REAL problem with any kind of delivery people. We had a hill/upper level behind the house in the backyard, and he would pace back and forth on the edge of it, snorting, sniffing, searching... for any type of delivery, starting around 11 am. It was like his mission. Once a truck or walking mailman was heard or spotted, he bolted down to the house level and toward the gates at either side of the front of the house going ballistic. The other dogs knew to stay clear, as he would snap at them if they tried to join in. I had to mount some sacrificial wooden closet rods on the fence for him to tear up instead of him chewing up the fence itself. I used to whisper, "Where's your UPS, boy?" to get him going, haha. I guess that was wrong? We also had a game when I was raking leaves. I was "safe" with the rake in my hands, but he would rush in and tear up the leaf pile when he could. Then, anytime I set the rake down, he would run in and start chomping down on my pant leg, and I had to drag him along. The game evolved with me strategically leaning big sticks against trees at various spots and I would have to sprint from tree to tree as he tried to get me when I was "vulnerable" without a stick. He was a pretty entertaining dog, ha.