Historical clue formulations

• Mosquito, by nature — 2023-12-20
• Risky dog to own — 2023-05-10
• Dog to avoid — 2021-07-12
• Dangerous dog — 2019-12-18
• Mean dog ... or a flea on a dog — 2019-05-30
• Dangerous dog — 2017-12-28
• Dog that needs a muzzle, say — 2017-11-22
• Dangerous dog — 2012-11-19
• Mean cur, typically — 2012-03-02
• Junkyard dog, probably — 2011-11-12
• Canine, e.g. — 2005-10-29
• Mean mutt — 2004-12-03
• Snake, by nature — 2004-11-28
• Snake, for one — 2004-02-29
• Flea or gnat — 1998-12-03
• Bad dog — 1997-10-23
• Dirty fighter — 1997-06-01