Foster's Home for Imaginary Friends

Land of the Flea (3x9)

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When Eduardo gets fleas while getting one of the house’s imaginary puppies to take a bath, he becomes discontent as the fleas are driving him mad. However, despite the way he feels, he decided to keep the fleas on him because he believe they’re his friends; though Frankie and Mr. Herriman want none of it and they decide to go to drastic lengths to get the fleas removed. Meanwhile, Bloo wants to get some fleas of his own and he does anything possible in order to attempt to get Eduardo to share them.