Historical clue formulations

• ___-pei (wrinkly dog) — 2018-05-24
• ___-Pei (dog breed) — 2015-01-05
• ___-Pei (dog breed) — 2012-12-02
• ___-Pei (dog) — 2005-01-16
• ___-Pei (Chinese dog) — 2004-11-14
• ___-Pei (dog) — 1999-10-22