It's a ruff business! Cesar Millan, the Dog Whisperer, talks pitfalls and success of building his brand Expert dog trainer, Cesar Millan (the Dog Whisperer) shares insight on his success, coming back from failure and his new show. Since beginning his career nearly three decades ago, Cesar Millan, aka the “Dog Whisperer,” has become the world’s leading voice in dog training and rehabilitation.