Maru just loves boxes. He does NOT like it when he can not fit in them! Maru does not lack any determination to try his best though.
Love how he makes it in at the end though. Wonder if he destroyed it. I’m guessing it was his awesome owner though. Haha Maru went to him for sympathy after failing to get in the frustrating box. Of course he had to take out his frustration by biting the cardboard! You get that box Maru!!