A dairy owner has been left shaken after the aggravated robbery of his Dunedin store last night.

At about 8.45pm on Saturday night, the offender entered the Prince Albert Road dairy armed with a weapon.

He threatened the shop keeper before leaving on foot empty handed.

The man is described as about 180-centimetres tall, of solid build.

He was wearing a blue scarf over his face, a grey jacket with the hood up over his head, blue jeans with faded knees, and dark coloured shoes with white soles.

Police believe he waited outside the shop for a short while before the robbery.

They want to hear from anyone who was in the area around the time, or with information about the robbery.