Answer:
What kind of fish chases a mouse?
I am a rodent that people sometimes keep as pets. I love cheese and have a long tail. What am I?
What has armor but is not a knight, snaps but is not a twig, and is always at home even on the move?
What peels like an onion but still remains whole?
I'm a marine mammal with flippers that balances balls on my nose and barks. What am I?
I love spinach.