I do think there are some dogs - although it's very, very rare - that do have to be kept away from all other dogs and all humans except for the one strong pack leader whom they trust. But I think I've run into less than a handful of dogs that were like that in my entire career.
Cesar MillanAll dogs can become aggressive, but the difference between an aggressive Chihuahua and an aggressive pit bull is that the pit bull can do more damage. That's why it's important to make sure you are a hundred percent ready for the responsibility if you own a 'power' breed, like a pit bull, German shepherd, or Rottweiler.
Cesar MillanIt is tougher for a dog to live without rules because he doesn't know what is expected of him. It is the mind, the body, the heart, not just the heart. Love is not enough.
Cesar Millan