Can't stand the bloke. Find him extremely cruel. This is what the American Humane Society says about him:
�As a forerunner in the movement towards humane dog training, we find the excessively rough handling of animals on the show and inhumane training methods to be potentially harmful for the animals and the people on the show,� said the letter�s author, Bill Torgerson, DVM, MBA, who is vice president of Animal Protection Services for American Humane. �It also does a disservice to all the show�s viewers by espousing an inaccurate message about what constitutes effective training and appropriate treatment of animals.�
Torgerson noted that the safety of a woman and her German shepherd were jeopardized in one episode by the use of an electric shock collar, which forced the tormented dog to redirect its aggression at its owner, biting her arm. �Furthermore, the television audience was never told that Mr. Millan was attempting to modify the dog�s behavior by causing pain with the shock collar,� he said.
These two articles also answer any questions people have about him:
http://www.4pawsu.com/cesarfans.htm
http://www.4pawsu.com/dogpsychology.htm
One of the basic 'training' methods he uses is flooding - would you get someone who is afraid of spiders and locking them in a small cupboard and pouring thousands of spiders in with them and leaving them for half an hour! That is what 'flooding' is.
The 'pack' theory of behaviour is also very outdated and has been proved many many times to be based on studies that were totally wrong.