Okay, so I have this cute little guinea pig and I'm always spoiling him with toys and stuff. One day I realized I didn't have a plastic ball for him to roll around in, so I went out and bought him one. But when I put him in it, he just kind of sits there. He started climbing up the side of the ball today, but he didn't roll. What can I do to convince him that he's supposed to roll in his ball?
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