I found this old Pratchett gem in a used bookstore and bought it without question, simply because I love Terry Pratchett as an author and I willing to buy his stuff sight unseen. I can understand how some people might find this book disappointing, because this is very early work and about as far from the Discworld as you can get.
That being said, I loved it. People looking for echoes of the Discworld won't find them, but people who are fans of James Herriott and Gerald Durrell and a certain type of English country writing will find this book follows in their footsteps. For me, it was like taking a step back into a pastoral England that may not even exist anymore. Also, this book was deeply appealing to me as a pet owner, who has been able to chronicle the misanthropic foibles of more than one benighted creature. What "Marley and Me" does for dogs, this book does for cats.