John Tough was reported missing from the Portree area of Skye, where he was on holiday with his family, having not been seen since 10 am on Thursday
Mr Tough, who is known as Jim, is described as 5ft 10 tall, medium build with dark hair but bald on top. He is believed to be wearing a cream jacket, dark trousers and shoes and he speaks with a Glaswegian accent. It is believed that Mr Tough was walking with his black labrador/collie cross dog.
Mr Tough is known to suffer from dementia and is not familiar with the area. As such, Police are increasingly concerned for his welfare and are eager to trace him. Although last seen in Portree, Mr Tough may try and make his way back to his home address in Cumbernauld.
Anyone with any information or possible sightings of Mr Tough are asked to contact Police Scotland on 101.