For those who have not heard about "Spot" before on Ron's "Owl's Head" comment:

He was the keeper's dog, who is buried at the light. He was trained to run out to the fog signal building when he heard or "sensed" a boat coming, jump up, and pull the rope setting off the fog horn to warn the ships off the rocks.

During a winter storm, Spot could not find the rope in the snow when he heard the Matinicus to Rockland mail boat returning. Not giving up so easily, he proceeded to bark wildly along the cliff's edge until he heard the ship's bell, confirming that the boat had cleared the bluffs.

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-RodW