If this doesn't get me rich, there's something wrong with the world

As many of you know, scratching the belly of most dogs will cause the dog to kick one or both legs in time to your motion.

Dogs usually enjoy this is and it can be entertaining to watch, however no-one has yet thought to take commercial advantage of this reaction.

Until now.

The idea is simple: a perpetual motion device.

Due to previously held interpretations of the laws of physics, no such machine has yet been produced.

Don't try and copy this as the patents are already filed, and I'll sue your ass but here is the idea:

Person A (you) approaches a medium sized dog, preferably well-natured and in good health. After gaining the dogs affections, coerce the dog into lying on its back and start to rub its exposed belly with your knuckles or palm. As the dog's head lolls back in giddy pleasure, use your fingers and nails to scratch it's belly until the dog's leg is kicking at an even rate.

Continue the scratching motion and call for Person B (your assistant). Person B brings a second dog, preferably similar in stature and disposition to the first, and places it adjacent to the dog you are scratching. Your assistant must deftly move his dog's belly into the path of your dog's leg. You may both relax now as the dog's kicking should maintain their momentum.

Backyard testing has proven this mechanism to be perpetual in its motion, and if you don't believe me I'll sue your ass.

My invention could be used in conjunction with this cat-powered contraption but backyard tinkerers should be wary of interspecial conflict.

I already have some big-name investors interested. Think HSBC, Macquarie Bank, Price Waterhouse Coopers &tc. so shut the hell up.