Thank you for the link.
No wonder he was so confident and proud of getting up onto the couch, he had done for his entire previous life! And honestly, I did not know what you mentioned.
One question: what if I teach him to go to his own little couch? Would he respect ours?
I'm not sure if "respect" is the appropriate word. It's more if he is allowed or not allowed, and you have to be very consistent. If you teach the dog that it can not be on the furniture, but he jumps up and someone lets him on it one time or two, then you may have to start over again. He will test you to see what his limits are. And if you aren't in the room, all bets are off, lol.