In this Oct. 18, 2012 photo, Cesar Millan poses with his English Bull Dog George, left, and an unidentified dog at his Dog Psychology Center, in Santa Clarita, Calif. Millan’s seventh book, “A Short Guide to a Happy Dog” is due out Jan. 1, 2013. On Jan. 5, Nat Geo Wild will premiere “Leader of the Pack,” a new series with a goal to increase pet rescue, rehabilitation and rehoming around the world. (AP Photo/Mark J. Terrill)