Est aliud mirabile in regione quae dicitur Buelt. Est ibi cumulus lapidum, et unis lapis superpositus super congestum, cum vestigio canis in eo. Quandro venatus est porcum Troynt, impressit Cabal, qui erat canis Arthuri militis, vestigium in lapide, et Arthur postea congregavit congestum lapidum sum lapide in quo erat vestigium canis sui, et vocatur Carn Cabal. Et veniunt homines et tollunt lapidem in manibus suis per spacium diei et noctis, et in crastino die invenitur super congestum sum. There is another wonder in the region called Buelt. There is a heap of stones, and one stone laid on the heap having upon it the footmark of a dog. When he hunted the swine Troynt, Cabal, which was a dog of the warrior Arthur, impressed the stone with the print of his foot, and Arthur afterwards collected a heap of stones beneath the stone in which was the print of his dog's foot, and it is called Carn Cabal. And people come and take away the stone in their hands for the space of a day and a night, and on the next day it is found on its heap.
-- quoted in: The Mabinogion. Lady Charlotte Guest, trans. (London : J.M.Dent &Sons, 1910). p 331.