My English mastiff, "Nixon" (named for his look-alike twin, Richard Nixon) will do the little dog trick of lying totally upside down to sleep...balanced perfectly on his spine, hind legs suspended and totally relaxed, front legs "begging". He extends his neck out so that the top of his head is on the floor, which makes his Nixon jowels flop open...which then fill with drool while he sleeps. He then snores (wetly) and farts. What looks pretty natural on a little dog looks like a beached whale scene on a 200 pounder.

This would be a perfect photo op except that he is wildly camera shy...he can hear the camera coming, somehow, and rolls over in a spray of drool, then skulks off so he can sleep in peace.

Now that he is 10 and mobility challenged, he seldom does this much any more... but he can still manage a few moments in his favorite position in the sun.