Jack, shown above, went missing whilst on a walk on the disused railway line from Valleyfield to Rosewell.
He was last seen at 8pm on Saturday night (24 August). Jack is five years old, microchipped, neutered and wearing a red collar.
His owner is of course heartbroken.
If you have seen, or have any information regarding Jack please could you call Missing Dogs Scotland on 07731 562 513.