hahahahaha! I have this same problem! I mean exactly. When you LOOK in Bo's direction he tries to High Five you - but lay right down, belly flat on the floor for a treat? Not so much. In my case, it's really my fault. I'm not consistent. It's hard with the two of them squirming around on the floor, trying to get the cookie via any means necessary. I give in.
My daughter took this video of Bo doing his infamous "high five" at the cabin in Sequim. High Five, Bo! - YouTube They're so adorable, I give them the cookie regardless. (see? Consistency. Totally my problem.)
You might be interested in some really fun videos on You Tube that teach dog tricks. The ones I get the most out of are the "Expert Village" ones. Here's the "Play Dead" one: Dog Tricks : Play Dead Dog Trick - YouTube Cute!