I just start to read this book and finished the first chapter about the origin of the AB and some theories. The author spend many pages about the topic. In general Mr. Putnam have consulted many old books or some work that had been quote old books, unfortunately he did not like to write the bibliography. I just do not agree with some theory written in this book about the infusion of St.Bernard, Pug and Terrier so as Filas Brasileiros.The other thing is the author need to know more about settlement of Brazil, they were Portuguese and not Spanish like the author imagine the ancestral of Fila was. Dogo Argentino also had many recently cross so as with APBT.The Cuba Mastiff and Perro Zimarrone were the dogs that had Spanish Bulldogs and Mastiff in their origin. I desagree too about the author in persist to trace the ancient crossed of AB tracing back to old Bulldogs and the white colors, because is something very easy to breed out in 4 generations or less. The other thing i am very interesting is his knowlodge about hunting wild hog and claimed about the pure Bulldog the AB is the best breed to hunting hogs.I beleive that some sort of AB are very good in these job and could have high performance but i know many particular breeder that have some they own breed and for jaguar hunting and hogs in Hawai (javali) and they cross are some % around 25% of APBT and other mix of hounds , probably high % of Fox Hound, and the selective breeding program had been did not more than 8 generations. The author insist in talked about some selective program the many sort of bulldog had passing from 200-300 years to prove the purity of the AB, its hard to imagine those many years without any out crossing to increase the vigor and consequently breed out again. The pure Bulldog never exist... from the first sort of the dog that had the job to deal with Bulls from now , many sort had coexist together.The performance dogs always had crossed in cycles to maintain the vigor.The ancient breeders did not had afraid to use foreigner breed that shows better performance and the infusion of better dogs were more than common its a requirement. The modern sort of AB its wonderfull, the genes that this breed have , with EB, APBT and or not and the drives for hunting, guard , weight pulling and many other task like cattle its a oportunity.All breeds have positive and negative points.... no breed could claim for the best in the canine world. In my opinion this book is very good i saw (readed) many excelent points and some theories that today with the genoma most of them failed. The author had deep knowlodge about the modern AB and wrote many info that still interest me a lot.The Johnson line was describe perfectly, so as other good points of view. I recommend this book for those like to buy a AB and for those that already have been starting to bred AB.I hardly recommend the reader to buy together , the book of The World Of APBT by Stratton and Colby books of the APBT, for simultaneously reading.