Dog Whisperer with Cesar Millan

Cesar heads to Las Vegas to help four Cirque du Soleil performers with their problem pooches.

Cesar helps expectant mother Ashlee Simpson-Wentz with her beloved, by aggressive English bulldog.

Cesar works with an aggressive sheepdog-collie mix and a St. Bernard who is afraid of stairs.

A Lhasa apso will eat just about everything in sight and a Great Dane is bullying other dogs.

Cesar helps pets with aggression issues, severe separation anxiety and an extreme fear of coughing.

Cesar works with two aggressive wolf hybrids and their owners to help them achieve domestic bliss.

Cesar tries to help a Blue heeler mix who growls, whines and barks ferociously at night.

Cesar revisits the demonic demeanors of one of the Dog Whisperer's most challenging breeds.

Cesar works withEileen Davidson's Wheaten terrier and a K-9 recruit who's afraid of shiny floors.

Horse Whisperer Pat Parelli joins Cesar to help with a riding center's dog and horse problems.

A tricky Pit bull and dachshund mix each have their own aggression issues.

Cesar contends with one of his toughest cases, a "red-zone" aggressive American bulldog.

A professional dog groomer reaches out to Cesar for help with three of her most difficult cases.

Cesar works to rescue and rehabilitate caged pups with animal rights group, Last Chance for Animals.

Cesar's expertise is needed to help a fearful adopted Doberman.

Kris and Lisa's son Ryan tries to avoid ankle attacks from their mischief-making terrier.

Can Cesar teach Roscoe, a fearful Akita, to walk the Cesar Way?

Cesar tries to calm an uncontrollable Yellow lab named Harley.

Cesar finds 3 dogs unwilling to play by the rules at a "dog friendly" ad agency.

Cesar helps Matt Sorum's French bulldog Miles who needs to be properly socialized.

A Sealyham terrier named Maxwell calls the shots at home.

Cesar meets with a shepherd mix who was one of 57 dogs confiscated from a hoarding situation.

Old and new cases show the process for adopting a dog, setting rules and dealing with loss of a pet.