Very good!

pros:
- informative and interesting, written in a very readable style with plenty of pleasant pictures
- the facts, data and science that was in there was interesting and most of it was new to me
- a great variety of dogs' jobs were included, and the ones to preserve the environment were particularly new to me
- though the terminology wasn't quite up to date in terms of political correctness, i didn't feel it was ableist in its descriptions of autistic people and people with disabilities

cons:
- a touch repetitive at times, perhaps because the book is meant to be dipped in and out of, rather than read straight through
- also likely aimed as younger audiences, as the science and facts were put in simplified terms and most of it was written in generally informative language rather than academic, with lots of statistics. I might have liked a bit more science, to show exactly how and why dogs react the way they do
- could also have gotten into dogs' training and how exactly they learn
- while the variety of subjects was good, it did seem to jump around with the chapter topics, between working dogs and pet dogs, pretty randomly

All in all, could have been specific and organised, but a quick, interesting read :)