"Don't Look a Smith Horse in the Mouth" is the tenth episode of the sixth season of American Dad!.
In the episode, when Stan gets told by Francine to get rid of his gas-guzzling SUV, he and Roger hatch up a plan at the local horse track to avoid losing his car.
When Roger tells Francine that Stan regularly spends $400 on gas for his SUV, she threatens to replace his vehicle with a Hybrid.
Stan is reluctant at first, but following Roger's promise that the horse is a guaranteed winner, he decides to buy it using his family's second mortgage.
In retaliation, Roger tricks Stan into giving the horse "a full release" in order to boost its confidence.
In order to receive their paycheck, Snot volunteers to retrieve Mr. Tuttle's wallet from his back pocket, but becomes trapped underneath him.
Mr. Tuttle then reveals he had the money in his neck fat instead of his back pocket and that he tricked them into staying with him due to his loneliness.
[2] The Parents Television Council, a pro-censorship group and a frequent critic of Seth MacFarlane-produced programs (Family Guy being the most frequent target) urged viewers to file indecency complaints with the Federal Communications Commission regarding the scene where Stan masturbated a horse, and got sprayed in his mouth with a garden hose.