Max use to lay like that all the time when he was younger (hes too old now)... My exfriends Rotti use to be chained to a door at night & he would lay on his back with his back legs spred out & then one of his paws would be touching his "u know" & he alwas had the silliest face on him too, his upper lips would be flopped over & his mouth would be open & his toungue would just hang out of his mouth.. it was the sillyest thing to see & boy did he snor!!!! u could hear him outside the house & u could feel it through the walls & floor.. the rule was to fall asleep before Rocky or u'd be kept awake from his snoring...
Rocky would also lay flat on his belly with his back legs stretched out behind him. Talk about a crazy dog... hehee