EDIT And, as is so often the case, more info surfaces from this tragedy: According to news sources,Mr. Hayashi later confessed that, in addition to showing aggression towards the young children in the home, his dogs had killed a pet Akita that stepped into the same garage where Jacob was killed. Things were clearly out of control in that home.
After a horrible fatal attack involving a pack of dogs in GA last year, Bonnie Beaver, a professor at Texas A&M University and an expert in pack behavior, explained that when pack mentality takes over "they do insane things that they would not do" under normal circumstances.
Again ...not a breed specific behavior. Skeptics can visit the link that shows two of the dogs involved in the GA incident. news: cnn
The ASPCA tells us that "Aggression is the most common and most serious behavior problem in dogs. It’s also the number-one reason why pet parents seek professional help from behaviorists, trainers and veterinarians."
Unfortunately, Mr. Hayashi didn't seek professional help for his troubled pack of dogs, even when he knew at least one dog (Kiwi) was - his description - "aggressive." If only we could go back in time and find a way to red flag him about the warning signs that were spelling disaster in his home. In memory of Jacob Bisbee, animal welfare advocates have an obligation and a responsibility to try even harder to bridge the gaps between communities so we can be the resource inexperienced dog owners and their families need us to be.
More info on warning signs and behaviors that warrant quick, proactive solutions listed here on the ASPCA's website
For More Reading
Brent Toellner's blog - KC Dog Blog - is always a good source for the nitty gritty on dog bites and fatalities.
Malcolm Gladwell's article from the New Yorker on breed profiling. Troublemakers
The Pit Bull Placebo in a free downloadable PDF from the National Canine Research Council.