maybe you could train him to stay off the furniture? it's a thought, at least.
or lock him out of the kiddo's room. if your son wants the door open at night, put up a baby gate in front of the door, and train the dog to respect the gate.
“I am the sea witch. I am the tide you fear and the turning you can't deny. I am the sound of the waves running over your bones on the beach, little man, and I am not amused at finding you on my doorstep.”
- the Luidaeg, Chimes at Midnight