Cesar Millan is hired by Mrs. Cartman in the episode "Tsst" to help improve Cartman's behavior. Unlike assorted nannies who were hired to discipline Cartman (all of whom were destroyed mentally or emotionally by him), Cesar's approach proves to be the most successful, as he treats Cartman like a dog, rather than a human being. Mrs. Cartman becomes so grateful for his help that she begins propositioning Cesar for a deeper relationship. When Cesar reminds her that he is merely there to teach her to control Cartman and then leaves, she back peddles on the training, causing Cartman to regress into his evil tendencies. He was not shown in the celebrity army in "200" and "201".
Cesar Millan has gray, spiky hair and a black goatee. He wears a dark blue, collared shirt and khaki cargo pants. He has a tall head and appears to be physically strong, as he handles dogs.
Unlike almost all celebrities that appeared on South Park, Cesar's depiction wasn't disrespected in anyway. In fact, he was shown in a very positive light, having been the only person able to manipulate and control Eric Cartman's behavior, to the point of causing him to temporarily behave like a rational human being.
- Caesar Millan is one of the few celebrities on South Park not to be made fun of for a certain trait or a racial or stereotypical joke about his race, unlike several other celebrities and characters on the show (although Cartman disrespects him by calling him "Mexican" in a degorative tone and insults him once by calling him a "Taco Bender").