Whistleblower Arturo is fed up with his neighbors Jim and Sam's powerful American bulldog/boxer mix, Matilda, attacking dogs in the neighborhood. Cesar witnesses Arturo's own springer spaniel, Coco, get attacked by Matilda and realizes immediate action is necessary. He invites them to his Dog Psychology Center to further rehabilitate Matilda and train Jim and Sam to be better pack leaders.Cesar's next call comes from whistleblower Rose, who is extremely concerned for her friends Diana and Joe's dog, Tosha, who attacked Rose so severely that the bites left her arm scarred. Cesar determines that Tosha is acting as Diana's "bodyguard," which is dangerous and may lead her to attack again. Cesar meets with Joe and Diana at his home training annex and shows the couple how to keep Tosha calm and submissive when meeting new people so she won't attack again.