Warning: Wikipedia contains spoilers.
This book tells of the escape of two dogs, Rowf and Snitter, from a government research station where they had been horribly mistreated. They attack some sheep on the fells of the Lake District in Great Britain and subsequently are bombarded to ferocious man-eating monsters by a journalist called Digby Driver. A great dog hunt follows.
Like its predecessor Watership Down, this novel has an animated movie based on it.