Unfulfilled in his career and love-life, George Potts did not suffer a mid-life crisis - he underwent a change of species. He knew not how or why, but suddenly found he could metamorphose into a racing greyhound. From a plodding, colourless, two-legged routine, he discovered he could transform his anatomy into that of a muscular, lightning-quick quadruped. This, it transpired, brightened up his life in ways previously unimaginable and became all the...