Konrad Lorenz was a pioneer of ethology (the science of animal behaviour) in Europe, over fifty years ago. He not only studied animal behaviour scientifically, but also valued animals as companions in his home. "Man meets Dog" is a readable account of the origins of the domestic dog and how these affect the relationship of dogs with people, using anecdotes of Lorenz's own dogs to illustrate his points. It is not a dog training book.
This book broke new ground when it was first published. Some of the scientific theories Lorenz describes have since been superceded or disproved, and so anyone reading this book for the first time should be aware that knowledge has moved on since his day. (For example, he discusses at length the character differences between breeds descended from jackals and those descended from wolves, while more recent thought suggests that there is no such distinction.)
However, anyone who's seriously interested in studying dog behaviour really should read this book, because so many other experts in the field based their work on that of Lorenz. Even now, it's an interesting book to read, and Lorenz's love for dogs shines through his writing. I would not, however, suggest anyone get this as their sole dog book; it should be read in conjunction with other books on the subject, and it won't really help you deal with problem behaviour in your own dog.