Historical clue formulations

• Pet kept by Wilson, Harding and Coolidge — 2012-07-14
• Dog originally bred to hunt otters — 2009-07-04
• Black-and-tan pet — 2005-03-17
• Wartime dispatch carrier — 2005-02-18
• Terrier type — 2004-11-14
• Terrier type — 2002-08-22
• Terrier type — 1997-09-23
• Wiry dog — 1997-07-21
• Black and tan — 1995-01-08