Okay. I found this:

Quote Originally Posted by Tania View Post
Over the years I have met a few people who have taken Serotonin to lift their spirits! Dr. Oyama mentioned out of all the dogs The Cavaliers are the Happiest Dogs in the World! probably because of the high levels of Serotonin. In laymans language, does this mean when MVD was not around, would the temperament of the Cavalier been different? Are the high levels of Serotonin relatively new. I will have a transcript of this around Wednesday if anyone would like a copy.
This is from the thread titled : "Dr. Mark Oyama's October 2009 Video on MVD" at http://www.cavaliertalk.com/forums/s...9-Video-on-MVD