These entries are on publish information that relates to taming. They go back as early as January 2000. Each entry includes a link to the page detailing it on Update Center.
Other changes prior to January 2000 (no accurate datestamp):
Guarding Changes - September 22, 1999
Fix for pets when they used to go wild on transfer - September 1, 1999
Various Pet fixes - May 25, 1999 (including death taming, nerfing while crossing server boundaries, and orneriness changes)