Related Clues:

• Black cat, perhaps
• Lab test taker
• -
• Garfield, to Jon
• Penthouse centerfold
• Porcupine, e.g.
• Kitten or parakeet
• Kind of theory
• Treat like a dog?
• Resident animal
• Stroke gently
• Favorite, as a theory
• Irritated state
• Muskrat or mouse
• Beaver, for one