Originally in German, I think the English version probably suffers in places from translations that could be improved. The example that springs to mind is "stress releasing" which appears in several places in a context where I would expect "stressful." Eventually I figured out that they meant something like "causing stress-related hormones to be released;" i.e., "stressful," "distressing," or "stress-causing." There were a few other similar issues.
The earlier reviewer is not wrong when she says the book lists a plethora of potentially stressful events -- too much attention, not enough attention, etc. But I find this information far from useless, and unfortunately not well enough publicized to call it "common sense." For me the book's value main is as a guide to diagnosis of behavior, plus the insight that dogs need their down time: left to their own crepuscular devices, dogs typically sleep 12 hours a day.
The book includes analysis of a survey done in Germany that attempts to quantify the extent of unrecognized stress in pet dogs. I think there are flaws with the methodology (self-selecting respondents, to top the list); but it's not bad, as long as you recognize the constraints. It's much better than nothing, and I'm glad the authors included it.
I see that there is a 2010 edition now -- I look forward to getting it. Hopefully some of the translation glitches have been fixed.