One door for cats, dog and humansSourced
He built a house door that his pets and people could all open.
Writer Paul Corey made a door at his California home that his two cats, dog and human residents could operate. Popular Science described it and printed a construction cartoon in 1959.
He treated the doorway as a shared problem to solve.
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Paul Corey · Wikimedia contributors
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Reviewed: 2026-10-02