Intelligence of Dogs

I got a copy of "Intelligence of Dogs" by Stanley Coren. While many dog authors, especially boneheads like Elizabeth Marshall whozits of "Hidden Life of Dogs" note, seem to attract mixed reviews, Coren seems to be widely respected. Other authors regularly quote or reference his books as source material. I've got a copy of another of his books, "How to Speak Dog" on the shelf, but I'm taking this one on the plane today and plan to make some headway.