That's exactly what happened with Fraser (who's asleep on the sofa beside me as I type.) I read the books, learned that it was important that the dog not think it was entitled to get up on the furniture as they could become territorial and snap at you when you wanted to sit down. Would invite Fraser up occasionally and have to get my hands under his bottom and haul him up. And then one day he sproinged like a deer onto the sofa. He didn't even look as though he gathered his haunches under him, just suddenly lofted into the air as if he weighed nothing and settled in. Like you, decided it was a silly rule (though I do have to fight for space just because he becomes such an inert little lump.) Now, unfortunately, he started to sproing onto the bed. That one I don't think he even knew he could do it which is too bad as it was the last peaceful refuge of the cat. Earlier today he squirted up and did a little jig up there he was so pleased with himself.