If this book appeals to you then I'm sure that you'll enjoy [[Life with Beau: A Tale of a Dog and His Family by Anna Quindlen]] and [[Old Dogs by Gene Weingarten and Michael S Williamson (Photographer)|Old Dogs]] – a look at the, er, more mature dog in words and pictures. I think you might find [[The Dog by Kerstin Ekman]] a fictional look at the life of a stray dog a little too gritty if you like to take the animal world a little less seriously.