Well I think it's up to the owner to research on there own the breed they are looking into and not rely on the rescue or breeder. Also yes, it may not be the handlers fault they became aggressive or reactive but it is the handlers fault if they don't fix it or hire someone who can. Dogs can be...
I was just lurking around but I wanted to say, IMHO it's not the dogs breed or genetics to blame for bad behavior and aggression, it's the person who hot a breed or line of dog they didn't have the time or experience or properly train and handle, yes certain breeds have tendencies but it's up to...