A dog is lucky to be uninjured after he travelled under a moving car on a NSW highway for half an hour.

The 18-month-old Jack Russell named Diesel travelled 30 minutes from Singleton to Huntlee.

Emergency services rescued the canine from under the motor of a vehicle this morning.

READ MORE: Weather balloon sparks mass panic in Los Angeles

A Fire and Rescue NSW team was involved with the rescue and returned the dog to its owner.