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how to get into bed when a cat and dog are already there
first, size up the competition/ welcoming committee.

second, start talking about TREATS and walk out of room. wait for dog to follow.
third, refer to an earlier basic chore: how to get into bed when a cat is already there. follow steps exactly while guarding door to prevent dog from returning.
Note: if dog returns during step three, repeat step two but with more treats.
DONE!