Well perhaps Mr. Pfaffenberger should have Guide Dogs for the Blind update their website. It states: The reasons the dogs are dropped from our programs are generally two-fold: Behavioral reasons (60%): high activity level, incompatibility with cats or other dogs, assertiveness requiring strong handler leadership. Some of these dogs may not be suitable for homes with young children or other pets. Medical reasons (40%): anything from allergies to cataracts to varying severities of dysplasia (hip and elbow). A bit different from %90 success don't you think? But, thanks for book recommendation.