Officers eventually escorted the passenger off the plane and brought her to the main terminal.
Video shows crowds cheering as she was taken off the plane.
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The incident is one of many recent cases involving emotional support animals on planes.
In another case, a woman tried to get an emotional support peacock through security at Newark.
In the last year, all the major airlines have changed their policies for bringing animals into the cabin.
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Most airlines require a note from a doctor, advanced notification and the animal’s vaccine records.
Most airlines have also restricted which types of support animals are allowed on board.
Delta, for example, has banned goats, hedgehogs and any animals with horns.