I have had my two dwarf rats for a few rats. At the beginning we didn’t have the proper materials to have them free roam. I would take them out every day and have them play on the couch with me until one day, one of them went into the couch. Since then I was worried so I made a play pen out of poster board and magnets. Whenever I put them inside the pen my one rat just bites and destroys it to get out. I then built them a castle of cardboard boxes, made toys for them, and everything I seem to do is futile. He will just chew it up and try to escape. They seem to like shoulder time but hate staying still and being cuddled. I don’t know how to interact or help make sure they are engaged. Please help I just want them to be happy rats!