Sometimes dogs know how to use furniture as well as people do. Our dogs all try to get the best seat. The best seat is generally considered to be beside mom on the couch. The next best snoozing real estate is considered to be one of our two giant, cushy dog beds, followed by the second couch in the family room.
Last choice is the couch in the other room or on the rug. They will try to make another dog move by standing over them or trying to fit into a space so small that they end up partially laying on one of the others, before they will lay on the rug.
It’s fun to watch the dynamics play out and see who ends up where. The outcome varies and you just never know what will happen.