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Boo-Boo Bear. For other uses of Boo Boo, see Boo Boo (disambiguation). Boo-Boo Bear is a Hanna-Barbera cartoon character on The Yogi Bear Show and Yogi's constant companion. Boo-Boo is portrayed as an anthropomorphic bear cub wearing a purple bow tie. Boo-Boo often acts as Yogi Bear's conscience.