Jacko the Cavalier King Charles Spaniel went missing at around 8.45am on 31st July on Northfield Way, Hallcroft, Retford.
He was seen being picked up by a man in a small white van with black writing.
Money is being offered by the ‘seriously devastated’ family for his safe return.
A ‘Find Jacko’ Facebook page has been set-up by owner Shelley as she is desperate to get him home.
Anyone with information should call Notts Police on 101 or 07919200919.