Historical clue formulations

• 1904 Nobelist who wrote "Conditioned Reflexes" — 2023-05-09
• Noted dog trainer — 2019-03-10
• Big name in conditioning — 2018-08-10
• Noted handler of dogs — 2012-02-29
• Conditioned reflex researcher — 2000-06-25
• 1904 Physiology Nobelist — 1995-07-26