Cartman excitedly tells Stan and Kyle to come with him to Kenny's house. Repeating the phrase "red rocket", he masturbates Kenny's dog to the point of ejaculation, or, as he says, "milks the dog."
Stan, thinking that what Cartman did was cool, demonstrates the technique on his own dog Sparky in front of his parents and their friends, for which he is grounded for ten months. Stan cannot understand why he is being punished, as his parents are too embarrassed to explain to him about sexual stimulation. The parents decide at the next PTA meeting the school should be giving sex education at a younger age.