Sorry for the long update. I haven't gotten a chance to read any replies yet. I got pictures of Dewey's parents and I'm a little concerned! They don't look like purebred corgis to me at all. The mom looks way too tall and the dad looks... odd. Maybe I'm just being difficult? Help!
http://www.geocities.com/teachersfirstpupil/10mom.jpg
http://www.geocities.com/teachersfirstpupil/dad.jpg