The Unadulterated Cat by Terry Pratchett, illustrated by Gray Jolliffe, is a book written to promote what Pratchett terms the 'Real Cat', a cat who urinates in the flowerbeds, rips up the furniture, and eats frogs, mice and sundry other small animals. The opposite of the Real Cat is the 'Fizzy Keg Cat', a well-behaved and bland kind, as seen on cat food advertisements. It was first published 1989 by Gollancz. Source: Wikipedia (en)