This site features in Macpherson’s Ossian poems of the 18th century. Even at the time people thought they were Rather Imaginative. But given that all folklore’s imaginative, perhaps it doesn’t hurt to mention his take on the stones, and who knows, perhaps it was a real local story after all.
So it seems the legendary Fingal brought his dog Bran over to Scotland when he visited the local chief. And the Sutherland chief had his own dog, Phorp. But the dogs had an altercation, quite a bad one really, where Phorp got his heart ripped out. This is supposed to have been at ‘Leck na Con’ (the stone of the dogs) between Clyne and Wildonan. And Bran didn’t come off so well either and had to be buried in Glen Loth – which is why this place is called Carn Bran.
(Summarised from the summary in ‘The illustrated book of the dog’ by VK Shaw, 1881).