This website has a really great list of ALL the pet skills that can be learned in the entire game. Should help anyone who wants to learn skills on their pet
http://web.archive.org/web/20070406191535/http://petopia.brashendeavors.net/html/articles/skills_list.shtml#shield
http://web.archive.org/web/20070406191535/http://petopia.brashendeavors.net/html/articles/skills_list.shtml#shield