Why is he getting up on the sofa?
Our last dog loved to look out the living room window. The only way she could see was from the sofa. We move the sofa and put an old chair near the window, she was happy to have her own place to watch the world go by.
Oscar is much the same. He likes to be able to see outside. If the sofa is away from the window, he does not get up on it. He lays on the floor in front of the family room sofa, but if he could see out a window from it, I am sure he would climb up.