Police are appealing for public assistance to help locate missing Natimuk man Rowan Woltjen.

The 38-year-old was last heard from yesterday by a family member.

Rowan is believed to be travelling in a white Holden Jackaroo registration SWA 964 and police believe he may be around the Horsham and Warracknabeal areas.

He may have his dogs with him, a whippet and a kelpie.

Rowan is described as 183cm tall, of medium build and has long brown hair.

Police and family hold concerns for his welfare due to a medical condition.

An image of Rowan has been released in the hope that someone may have information on his current whereabouts.

Anyone who sees Rowan or his car is urged to contact Horsham Police Station on 5382 9200.