A dog is on its way to Asia after police rescued it from a swamp following its escape from New Jersey's Newark International Airport.

The collie named Dart got away from United Airlines' pet transport service on Monday morning. It threaded through traffic and several parking lots before ending up stuck in the mud in a swamp.

Airport police used a rowboat and snare to reach the dog. Dart was not injured during the 45-minute rescue.

The dog was cleaned up and reunited with his owner to make its flight.

Airport officials were unsure where in Asia the owner and dog were headed.