I know, I'm really on a dockdogs kick here! But I can't help it! Until I get Heffner jumping, I just have to admire other people and what they've done. One of the events in the general sport of "dock diving" is Extreme Vertical. This is where the dog has to jump off the dock, into the air, to retrieve a bumper that's hanging at a specific height over the water. As the dogs progress, the height of the bumper increases. Here's a clip of some high jumpin' dogs!