"My mother-in-law, Richenda Digby, saw Shuck.  She found him quite a peaceful mongrel about the size of a Labrador or rather bigger.  There was nothing in the least alarming about him.  She met him in a lane near Sidestrand, on the Norfolk coast.  He came trotting towards her, and just as he had passed her she looked round and he had vanished.  I gather she was neither surprised nor alarmed".