Historical clue formulations

• Dog ... or a type of dog — 2021-01-30
• Elvis's "___ Dog" — 2020-08-31
• Harass — 2016-06-19
• Harass nonstop — 2012-06-29
• Harass nonstop — 2010-11-14
• Keep after — 2005-11-14
• Pester — 2003-10-12
• Keep after — 1998-06-16
• Bother à la the media — 1994-03-19