We own two presas.
I've already made several aborted attempts to chime in with more detail and information here, just because I feel the need to provide a good, first hand perspective on what it's like to live with these dogs and what I know of their history - and it's turning out to be tough for me because I'm absolutely ill over the tragedy in Florida.
I'm not optimistic that we'll ever know all the circumstances surrounding this horrible tragedy. I really hope that more background information becomes available but I'm not optimistic due to all the sensationalism surrounding the breed.
I've honestly been physically sick over the whole thing and for that reason I just can't seem to put it all together myself - so I'll differ to two really good sources for accurate, objective information about the breed:
1) The El Presa forum
http://forum.elpresa.com
2) Manuel Curto's site
http://www.irema-curto.com/default_ing.htm (Curto is a "modern father" of the breed and a wealth of detailed, honest information)
There are many other good resources, obviously, but those are good starting points.
The bottom line is they're dogs. Big, powerful, capable dogs that will behave as dogs behave. Consequently, you don't want to do wrong by these dogs as the stakes are higher than they would be with a less-capable breed. That's what makes them "not for everyone."
We've put a lot of time, effort and commitment into getting it as right as we possibly can. As a result, the "return on investment" has been great for us. We owe Mr Frawley a great debt of gratitude for the mileage we've gotten from his site and forum. (thanks Ed)
If anyone has any questions about our personal experience with two presas, please ask anything and I'll be glad to answer as honestly and as accurately as possible. Every attempt I've made to offer up personal anecdotes about how wonderful our dogs are seem cliched in light of this tragedy, so I'm not going to bother. Suffice to say, our dogs have required a serious commitment. But, I have to say, being put in a situation where we MUST take our dogs seriously has made us much better dog owners than we might be otherwise and they've turned out to be wonderful, manageable dogs that we enjoy that much more as a result.
Our dogs' days are filled with cats, strangers, crowds, children, nail trimming, bathing, pills shoved down throats, chicken bones pulled out of mouths, strange dogs (kept at a distance), roughousing and various and sundry other things that might incite less stable dogs. There had been a couple of hairy moments of limits-testing early on, but with the help of this site and some other great resources, we were able to get them behind us (the Groundwork articles are cannon in our household). Bottom line is we're doing fine with our dogs, but there are some other dog owners in the neighborhood who probably would not do fine with them.
Regarding Jones' book, _The_Red_Zone_ - well, some of it definitely rubbed me the wrong way because much of what she writes about the breed is just true-crime pulp and plain inaccurate. That said, I found the book very informative regarding how the dogs in Ms Whipple's attack got to where they did. It's like step-by-step instructions on how to create a monster (unsocialized and poorly cared for from day one, allowed to kill livestock, always chained, etc, etc).
If any good at all came out of the SF attack, it's the wealth of background information on how to do everything exactly wrong.
DH