While I would NOT say the book is preachy (except maybe to those who aren't vegetarian), and it did have very good information for children (and adults, frankly) - I was not as happy with the WAY the information was PACKAGED.
I think children like colorful pictures. There was NO color in this book, and while one publisher's comments described the illustrations as "delightful," I would be more inclined to describe them as drab.
I was also surprised when I picked the book up. The cover had me expecting a good sized book, when it is actually an oversized cover with scant few pages between.
I would still recommend this book, as there are so few with its message. I would just want the buyer to know what they're getting.
Another reviewer recommended Herb the Vegetarian Dragon instead. I would suggest buying BOTH! What this book lacked in eye-candy, Herb had in abundance. But, this book is needed to counter the bland delivery of the message found in Herb.