There have been books about dogs since books began -- manuals on training and raising them, stories featuring dogs, and memoirs seen through the eyes of dogs. Lately, there has been a rash of books that purport to tell us what dogs are thinking, such as the bestselling <I>What Dogs Are Thinking.</I> <P> This is a book about a Jewish boy and his sled dogs -- also a couple of wolves, a parrot or two...and Pinkwater's uncle...and his father. Daniel Pinkwater, prodigious author of books for children, popular commentator on National Public Radio, and dog trainer to the stars, is unclear about what dogs are thinking. In fact, he appears to be completely baffled by them. He considers himself lucky that his dog does not foul the carpet, bite people, or run in traffic. Unlike every other dog book ever written, this one does not make the reader feel more stupid than the author.