Instruct: Classify Amazon reviews into positive or negative sentiment
Query: A good reference book

I got this book because I wanted to know more about the vaccines and their effect on dogs. I did not get a chance to read the whole book but I like the information that I have read. The chapter on vaccines is very informative and does not just stop at yes give it no avoid it but it explains the different types of vaccines which is an eye opener. Another book I plan to get is the Natural Pet Care by Gary Null PH.D. He has both the book and the video and I think it will be an even informative than this one (in particular the vaccine section).