He makes dogs afraid to mess up, therefore the dogs are living in a world of constant stress. Read a few books on dog body language like The Other End of the Leash and then on calming signals (you can probably find that stuff online as well but Turid Rugaas has a book on them that is supposed to be good). Calming Signals are used by a dog to say "I'm not a threat" and they use them when they are being threatened to try and make the person or dog calm down because they are being scary. read:
http://www.canis.no/rugaas/onearticle.php?artid=1
If you watch Cesar's show and watch the DOG you will notice dogs giving these signals left and right. unlike Cesar says, the dogs are not suddenly thinking what a great leader he is they are scared of the aggressive man and would like him to calm down. At the end of one episode a Weim I believe was offered a treat which he would not eat, dogs under extreme stress refuse food. plus that article which I read a while ago (thanks Doberluv!) mainly talks about why Cesar's methods make no sense so even if you can't believe that he is mentally and emotionally harming dogs you should at least be able to see that he is an uneducated dog trainer who knows very little about dogs.
Cesar simply punishes a dog until he is afraid to think for himself. like with his dog aggression cases, dog lunges at another dog so he grabs him and throws him on the ground and hold him there, then repeats over and over until the dog is warn out, afraid of the scary man attacking him and so he gives up, he has no idea what to do. So he lays there. fixed right? no he still hates that dog walking past, still has NO idea of what to do but is afraid to do anything at all because you might attack him again. So he stands there, stressed as can be, wanting with all his little heart to attack that dog but scared with all his little heart that you will attack him. Is that what you want? an aggressive dog to afraid to act but still angry and now stressed and scared as well? OR you could teach your dog to like other dogs through socialization and desensitization or in the case of true DA dogs can teach them WHAT to do INSTEAD of attacking the other dog. By simply letting him know what to do you can eliminate the stress. Teach him to look straight at you when he sees a dog, that way he will not be worried about messing up (he has been taught through Positive reinforcement that looking at you is what he needs to do, no guess work with fear of punishment) and will not be looking at the dog so his aggression should lessen, he can't attack another dog is he is not looking at or facing him. plus the dog is focused on the command so he is not as occupied with "get that dog" thoughts. therefore dog is not stressed. of course that actually takes WORK and for some people they would rather just punish the dog until he stops and not think about how their dog feels about it.
I shouldn't have said anything because I'm afraid we might start a debate but I can't sit by and let people think what Cesar does is harmless. Sure physically maybe but remember dogs can think and do have emotions, they even express them so listen to the poor dog being wrestled to the ground or jerked around by the throat or otherwise intimidated by the aggressive, intimidating man.
Cesar makes my blood boil