Historical clue formulations

• Popular pet originally from Mongolia — 2023-07-01
• Small rodent — 2022-05-15
• Pet store offering — 2010-04-07
• Animal in an exercise wheel — 2009-11-22
• Playful rodent — 2009-07-12
• Furry pet — 2006-08-16
• Burrowing pet — 2000-11-30