The male collie cross – nicknamed Scafell by staff at an animal welfare charity – was discovered by holidaymakers at the summit of Scafell Pike in the Lake District.
English police were unable to assist the couple in their quest to find the dog’s owner, so took Scafell to their home in South Ayrshire before calling the Scottish SPCA.
The dog, believed to be between five and eight years old, is now being cared for at the charity’s animal rescue and rehoming centre in Glasgow.
Scottish SPCA manager Anna O’Donnell said: “The couple who found Scafell said he was petrified and nervous and it took them around half an hour to coax him over to them.
“Unfortunately Scafell isn’t microchipped so we have been unable to trace his owner.
“We have also searched for information about dogs who have gone missing in the area with no luck.”
According to Miss O’Donnell, it is a mystery how Scafell ended up at the top of the mountain. He may have made his own way there after being abandoned nearby, or could have become separated from his owner during a walk.
She added: “It would be fantastic if we are able to reunite him with his owner if he has gone missing. If not, we will find him a loving new home in Scotland.”