Just finished On Talking Terms with Dogs: Calming Signals (Turid Rugaas). It is a short book, only 75 pages or so, but gives sooo much insight into the little signals our dogs give us every day! I highly recommend reading it. I also started to read "Canine Body Language, A Photographic Guide" by Brenda Aloff which I can also recommend. It covers all kinds of signals dogs give, fear, warning, guarding, targeting, playing and so on. Both books are a good starting point for people who want to learn more about dog language.