This book is easy to read and full of anecdotes. It is clearly written by (and for) someone who loves all animals. Even if the reader doesn't want to take away anything of the Buddhism - yes, that's the first word of the title, though - I think that reading it will broaden or sharpen their appreciation of animals as beings and co-inhabitants of the world. However little the reader decides to implement from the book, the awareness that animals have things to say if we listen can only improve the lot of our animal companions and us, and our relationship with them. From one quick read, I have changed the way I see my relationship with my non-human family members and will be changing the way I interact with them. It can only be for the better.
I wish I had read this before any of my pets died.
The one thing I will take issue with is the fallacy repeated here that you don't have to worry about being vegan because there are insects on plants that we eat who are killed, and a bug might die on our windscreen. The definition of 'vegan' according to the Vegan Society: "Veganism is a way of living which seeks to exclude, as far as is possible and practicable, all forms of exploitation of, and cruelty to, animals for food, clothing or any other purpose." (Vegansociety.com) The important words here are "possible and practicable". It's about doing as much as you can, not giving up because your rental property has woollen carpet.
It is not possible to avoid causing any harm: your body kills bacteria without you even knowing, and nobody expects you to crawl along with a magnifying glass as you walk to check for ants. The plant foods we eat might have hosted insects who died so that we could eat the plants, but to have it otherwise (picking them all off, maybe) isn't practicable. Eating meat doesn't mean you're not eating plants, either, so by not being vegan you are still killing those insects and small animals. Also, the animals you eat are eating a far greater number of plants - and therefore insects - per calorie of food you get; eating meat is a far less efficient way of getting calories.
So, pet-wise, this book is great; farm animal-wise, it tries but then falls back on long-since-debunked arguments. It was so good until then.