I have them all.
I like Monica's book, it is very much about individual diets for individual dogs. She believes a raw diet is best but understands that not all dogs (or owners) will do well with raw, so she discusses cooking, combining raw and cooked and, briefly, kibble. She gives suggestions on diets, foods, or supplements specific for common problems. The book also has nutrient profiles for some raw meaty bones. Monica's website is
www.doggiediets.com and she runs the K9Kitchen yahoogroup.
Dr. Pitcairn's book is pretty standard for most holistic/natural rearers. He also has sample diets, and goes a lot more into treatment options for specific ailments. (Monica's book is strictly about nutrition - Dr. Pitcairn's includes homeopathy, herbs, and other holistic modalities.) Dr. Pitrcairn's website is
www.drpitcairn.com
Wendy Volhard's book goes more into the theory and practice of some alternative therapies, like kinesiology and TCM. She does discuss diet quite a bit, although some of the section reads like a long ad for her commercial products, and she's a little more paranoid about raw meat and bones (and more lenient about vaccination) than I am. I pretty much just use the second half of the book.
It's also handy because she has normal physiological information - not only temperature, heart rate, and respiration rate, but also blood values (and what some of them mean), urine pH, etc. Wendy's site is
www.volhard.com, her commercial food site is
www.phdproducts.com There is a Volhard list at yahoogroups, too.
I have to admit, I read Dr. Ackerman's book 4-5 years ago and haven't really looked at it since! Skimming through it now, I'd ignore completely the chapter on commercial diets.
He goes into a lot of detail on different vitamins, minerals, and supplements, though, so the book would be a good adjunct to a well-rounded library. (Actually, I'm glad you asked the question because I'd forgotten he had all that information!)