A dog trapped down a 3m hole on a construction site was rescued but ran away.

A cocker spaniel cross was rescued from a construction site in Clover Park, South Auckland, after it fell in a hole.

Northern fire communications shift manager Jaron Phillips said rescue crew initially thought the dog was a stray but when rescued found the cocker spaniel had a lead and collar.

"The dog attempted to bite a firefighter and ran away," he said.

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The name of the dog remains unknown.