We had the same thing happen when he was the same age. I believe that he just liked the "den" effect. I was terrified because the couch has BARELY any room underneath it and he would be able to get in but it was very hard to for him to wiggle himself out. I discovered that by getting upset while he was under the couch just upset him and then he banged his head while trying to get out. My poor little love bug! When my husband was home he would be able to lift the couch and I would grab him. Obviously we were deathly afraid that the couch could fall while it was lifted. We ended putting "tube style" Fed Ex boxes which block the back of the couch. They are triangular and long. It blocked him until he learned that he could push the boxes out of the way. Smart cookie! So then I put 5lb weights inside each tube. Worked great but then he began chewing the boxes. Now we still have the boxes and we have an expen around the back and sides of the couch with the Fed Ex boxes. Sometimes he still manages to sneak thru to get a quick chew but it really has worked for us!
