One of the guys grabs the shotgun and shoots the dog. The shotgun is loaded with #8 birdshot, hardly big enough to stop a Lab. The dog stops for a moment, slightly confused, but continues on. Another shot and this time the dog, still standing, becomes really confused and of course terrified, thinking these two geniuses have gone insane. The dog takes off to find cover, under the brand new Navigator truck..
The men continue to yell as they run away. The exhaust pipe on the truck is still hot, so the dog yelps and drops the dynamite under the truck, and takes off after his master.
Then --BOOM-- the truck is blown to bits and sinks to the bottom of the lake in a very large hole, leaving the two idiots standing there with this "I can't believe this happened"look on their faces.