Walkers following the cliffs between Borthwen and Trearddur Bay may notice a low inscribed stone between White Arch (Bwa Gwyn) and Black Arch (Bwa Du). Overlooking the sea, it is inscribed `Tyger Sep 17th 1819`, and commemorates the bravery of a dog that guided his master and crew to safety when their ketch sank half a mile offshore in mist. One of the younger crew hung on to his collar and, after taking him to land, the retriever dragged another man onto the rocks. Although all the men survived, Tyger died from exhaustion.