Cow and Chicken (1997)

Season 3: Episode 2

Cow has a crush on Crag, the smartest kid in school, but is ignored by him. Her friends try to convince her that her horns are too small, so she tries every way to make them bigger by decorating them with coat hangers, paper masche, and even chocolate chip weenies. Cow later learns that Crag wasn't interest in Cow, because he had a crush on one of her friends.