My Little Pony: Friendship is Magic S1 Ep19 "A Dog and Pony Show"

Rarity enlists Spike to help recover gems for a large order of dresses. As they work, Rarity is abducted by Diamond Dogs, who want her to dowse for gems in their caves. Spike races back to get the others to help rescue Rarity. Meanwhile, Rarity is able to use her wiles to trick the Dogs into treating her in the royal manner. By the time Spike and others find Rarity, the dogs are willing to let Rarity leave with large quantities of gems, not wanting to suffer under her anymore. The others help pull the gems back to Ponyville, while Rarity comments that one does not always need strength to win over one's enemies.