The Simpsons
Apocalypse Cow (19x17)
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Bart joins the 4-H club and falls in love with a cow named Lou, but when he finds out that Lou is destined for the slaughterhouse Bart gives the cow to Mary, a fellow 4-H member, and her father mistakes the cow for a dowry. Homer and Marge come to the rescue to try and free Bart from his marriage agreement.