Demon Chihuahua Tina Madden, who works in a vet's office, adopted NuNu, a stray who was brought into the office. He attacks her roommate, Barclay Quinn, and anyone else who gets near Tina. Cesar tells them that since NuNu is a nervous dog, giving him affection while he is anxious nurtures the nervous state of mind.

The Wrath of Opie Suzanne Ohanesian lives with Opie, a Lab mix who is very dog aggressive. When Suzanne tries to restrain him, he will turn and bite her. Cesar explains that dogs need to earn food and affection. Cesar takes Opie for a walk, and has his wife, Illusion, walk by them with one of their dogs.

Scared Family Dog Larry and Ann Klein and their children have a Vizsla named Ruby who seems to live in a nearly constant state of terror. She is extremely possessive of her food, toys and treats, and cannot tolerate cameras.

The Yap Dog Kristy Thom and Jody Sherman live with a Chesapeake Bay Retriever named Boomer, who barks incessantly and demands constant attention.

Hell on Wheels Beverly Keeley and Janet Parker adopted Harry from their local shelter, and have discovered that he becomes very aggressive to anything on wheels, such as bikes and skateboards. It's become impossible for them to walk him because he pulls badly and since he's a German Shepherd mix, he's a powerful dog.

Stubborn Shih Tzu Eula Manocchi and her son Anthan have a Shih Tzu named Sueki who will not walk on a leash; however, when they walk her without a leash, she takes off if there is a distraction. When they try to use a leash, Sueki shuts down, sits down and will not move. Cesar takes her outside, walks away from their home, then puts the leash on her and allows her to stand and get used to it.

Pampered Puli Academy Awards Telecast Producer, Michael Seligman and his wife, Teresa Cusick have a white Puli, named Slick, who is very timid, which causes him to show fear aggression. Cesar suggests that Slick visit the Dog Psychology Center in South Los Angeles to give Cesar a chance to evaluate Slick's behavior and how Michael and Teresa interact with him.

Bouncing Bouvier Tedd Rosenfeld and Shellie Yaseen adopted an adolescent Bouvier des Flandres named Gus, who very rambunctious.

Raging Rottie Churchill is a Rottweiler/Shepherd mix who goes berserk when taken for walks. When he bit a neighbor who was petting him, the owners, Amir and Stephanie Kaspian, called Cesar. Churchill is so dog aggressive that Amir believes he cannot be socialized. Within two minutes Cesar has Churchill walking with one of his own dogs.

The Good, the Bad, and the Bubba Heidi and Hal Wasserman own Bubba, a Maltese who is very, very spoiled. Bubba goes to work with Heidi and Hal, but attacks their clients when they try to leave, and even though he is tiny, he will attack large dogs. He completely rules the roost, but Cesar shows Heidi how to become the pack leader, who loves him very much.

There's Something About Emily is a 6-year old Pit Bull who is extremely dog aggressive. At home she is very sweet, but while out walking she completely changes. Her owners, Jessika Palmer and her father, David Palmer, fear that she will harm or kill another dog. Cesar takes Emily for a walk, and has his wife, Illusion, walk past with their Pit Bull, Daddy.

Paris is a long-haired Chihuahua who lives with students Nelson Chang and Jhett Brown; Paris is a tiny tyrant who bites, barks, and generally rules the roost. Cesar tells them that even though Paris is tiny and adorable and easy to carry, he still needs exercise and walks.

Linda and Bob Weide have a Shepherd/Lab mix named Jake. Jake is dog aggressive when he is on leash; off leash at the dog park, he's fine. Cesar explains that the leash itself represents something negative to Jake. When a leash is an uncomfortable experience, everything around it is suspect, and that Jake must be walked with structure so that his negative reaction can be rehabilitated.

Tanya Vener and Allen Medven have nine Yorkshire Terriers, one of whom is named Scrawny. She is extremely possessive of Allen and bites anyone who comes near him. They hope that Cesar can help them with this problem. After establishing the reason for this behavior, Cesar shows Allen how to modify his behavior toward Scrawny, and not to pick her up or otherwise give in to her demands.

Patrick Lawlor and Karen Erbach have three dogs, one of whom is Alice, a Border Collie mix, who occasionally goes berserk with other dogs, including the two who live with her. There is apparently a pack dominance contest going on between Katie, an Akita, and Alice. It appears that Katie may actually be the aggressor, initiating the fights.

Manic Miniature Pinscher Chad Canale and Daniela Schnebly live with Caper, who amuses bystanders with her manic behavior, but they are concerned that Caper is showing compulsive behavior, particularly with balls. When they walk her she tries so hard to pull ahead that she dances on two legs.

Terror Bella Elisa Francescon and her daughter and niece, Heather and Nicole have a Border Terrier named Bella, who is very aggressive toward anyone coming into the Francescon home. As he usually does first, Cesar and the ladies take Bella for a walk and Bella challenges each of them with her bad behavior on the leash.

Beware of Teddy Steve and Lisa Garelick's yellow Lab is aggressive toward people and other animals. He acts friendly, but then, out of nowhere, snaps and bites. Cesar begins by explaining to Lisa that there are two positions with dogs, the dominant one, or the follower.

Old Dogs, New Tricks Sasha is an extremely aggressive 12-year-old Lhasa Apso owned by Lois Rubino and Barry Heck. She has been biting her owners for nearly 12 years, and they hope that Cesar can help them. She will not walk on leash, and is very toy and food protective, but Cesar assures them that it is never too late to change aggressive, dominant behavior.

Nicki is a highly dog-aggressive Rottweiler who came from a horrible situation in a homeless camp. Kathleen Daniels and her son Donald rescued him and now want to get him past this aggressive behavior so that he can have the life he deserves. Cesar and his wife, Illusion, test Nicki with one of their dogs, and Nicki does quite well.

Percy's Peculiarities Percy is a West Highland White Terrier owned by Diane Engstrom. Percy will not allow anyone to touch his hindquarters, and he absolutely loves to tear up Diane's mail, which comes into the house through a slot in the front door. Cesar bluntly tells her that the problem is her lack of disciplined follow-through with herself and with Percy.

A Puzzle Named Pepsi Marcela and Bartolo Gonzalez have a German Shepherd named Pepsi and a Himalayan cat named Kitty Love. Pepsi is quite aggressive toward Kitty Love, which concerns the Gonzalez's. As a member of the camera crew finds out the hard way, Pepsi is also very protective of Marcela.

A herding mix can't stand his owner's new boyfriend and an English Bulldog who is defensive towards visitors.

Mixed up Chow Deborah Carmichael, Damon Carr, and Deborah's daughter, Catherine, live with Stewart, a Chow/retriever mix who barks incessantly, and from the families' description, sounds like she has multiple personalities. As always, Cesar starts by teaching them to master the walk.

A hyper yellow Labrador and a Golden Retriever/Sheltie mix who doesn't like horses.