They train chickens with clickers! They make excellent students but you must think fast as they do everything very quickly after the signal.
One of the worst problems I have personally been asked to consultant on was a man who got severely bitten trying to dominate his dog. He was meticulous and careful about following the steps Cesar discussed so he felt he could do what Cesar did. The dog bit him several times on the face. Cesar's methods taught the owner how teach the dog to no longer warn with a growl so the dog didn't and just started biting the owner. Cesar does have a caveat on the show to not try of his methods without a professional trainer for good reasons--liability and he knows some methods can only be done by a professional. Victoria Stillwell has a better handle on this and I appreciate her methods.
Seemingly aggressive dogs can often be reacting out of fear (fear biters) and confusion. Trust and clear instructions that the dog can understand must be established before you can solve the problem. Cesar uses the quick, sometimes brutal fix that may not last but looks great on TV.
I don't want to trash on all his methods as some are quite good! I especially appreciate that he does give hope to those who have dogs with serious problems and that is a great breakthrough
He also follows some basics all professionals recommend (or at least all should) to balance the dogs behavior by exercise--you can't ask a dog who is so full of energy and therefore anxiety to behave perfectly without an outlet for that energy.
Someone mentioned Kohler--a trainer who did train WW dogs but those dogs had so many issues they were either destroyed or left behind once the war was over (some of the handlers did want to take them back but they would've been great liabilities)--an issue that truly saddens my heart. His sometimes cruel methods were dropped for more positive methods several years ago. I actually adopted an ex-military dog who is five years old now who we absolutely adore and she is well socialized and lives happily in our suburban home. Positive methods are trust building and clear instructions last a lifetime.
Cesar's methods can work on dogs who do not have more extreme behavior issues and therefore may last as during the process the dog may figure out what you are asking of them which is the key to success along with consistency. I rather a dog who thinks what can I do to make everyone happy instead of one not wanting to do something because of a severe repercussion. Both methods work but it's a personal choice. However, if it is a serious issue you need to find the root of the issue and work on helping the dog understand exactly what you want and seek a local professional behaviorist. Again I recommend Dr. Patrica McConnell's books--not only do they explain dog's behavior but its full of humor and great tools on how to identify what is going on and how to solve the problem.

One of the worst problems I have personally been asked to consultant on was a man who got severely bitten trying to dominate his dog. He was meticulous and careful about following the steps Cesar discussed so he felt he could do what Cesar did. The dog bit him several times on the face. Cesar's methods taught the owner how teach the dog to no longer warn with a growl so the dog didn't and just started biting the owner. Cesar does have a caveat on the show to not try of his methods without a professional trainer for good reasons--liability and he knows some methods can only be done by a professional. Victoria Stillwell has a better handle on this and I appreciate her methods.
Seemingly aggressive dogs can often be reacting out of fear (fear biters) and confusion. Trust and clear instructions that the dog can understand must be established before you can solve the problem. Cesar uses the quick, sometimes brutal fix that may not last but looks great on TV.
I don't want to trash on all his methods as some are quite good! I especially appreciate that he does give hope to those who have dogs with serious problems and that is a great breakthrough

Someone mentioned Kohler--a trainer who did train WW dogs but those dogs had so many issues they were either destroyed or left behind once the war was over (some of the handlers did want to take them back but they would've been great liabilities)--an issue that truly saddens my heart. His sometimes cruel methods were dropped for more positive methods several years ago. I actually adopted an ex-military dog who is five years old now who we absolutely adore and she is well socialized and lives happily in our suburban home. Positive methods are trust building and clear instructions last a lifetime.
Cesar's methods can work on dogs who do not have more extreme behavior issues and therefore may last as during the process the dog may figure out what you are asking of them which is the key to success along with consistency. I rather a dog who thinks what can I do to make everyone happy instead of one not wanting to do something because of a severe repercussion. Both methods work but it's a personal choice. However, if it is a serious issue you need to find the root of the issue and work on helping the dog understand exactly what you want and seek a local professional behaviorist. Again I recommend Dr. Patrica McConnell's books--not only do they explain dog's behavior but its full of humor and great tools on how to identify what is going on and how to solve the problem.