What an awful tragedy :(. That poor family.
Generally speaking, there seem to be 2 types of dog attack:
- Defensive/fearful aggression, where the dog perceives a threat and feels forced to go on the offensive.
- Prey driven aggression, where the dog sees a human/other animal as prey due to perceived weakness and/or behaviour (squealing/wriggling/crying/running).
Lots of "pitbull" attacks in the States seem to fall into the second category, where the victim is a young child, baby or elderly person. 100s of people are injured and killed every year, often just walking down their own street. I have watched loads of these attacks captured on cctv and have never, ever, seen the dogs being intimidated or antagonized into attacking. Usually, they appear from nowhere and are highly excited. The more the person fights back, the more ferociously they attack.
People seem to believe their dogs intrinsically understand that a baby is a small human and part of the family but that's making a huge assumption imo.
Bull breeds have been selected, over centuries, for "gameness": strength, tenacity, high pain threshold and willingness to fight/kill/take down large prey (bulls!!). Once they start, they do not stop. Dogs that give no warning before they attack are much more effective predators/fighters, making them difficult for your average person to read. They have huge jaws relative to the size of their head and their biting style is to hold and shake. This makes them far, far more dangerous than, say, a lab or a collie, which will usually bite and release. Comparing them to Chihuahuas or Shitzus is just laughable.
Unsuspecting families are being told they are "nanny dogs", a lie that seems to have originated with the breeder of the first Amstaff dogs, as a means of selling unwanted fighters. A man whose own dog mauled his young nephew to death.
I used to be staunchly anti BSL, and appreciate the difficulties in enforcing such legislation, but the reality is the gene pool of these dogs is fucked due to human stupidity and they are potentially extremely dangerous. Your average dog loving family (who may be completely clueluess about dogs) is just not equipped to handle them safely.
I get that pitbull is a difficult thing to define, but they do generally fall into a type. I think the UK system where you have to register the dog, keep it muzzled in public, and demonstrate you can care for it responsibly is a pretty good one. And should probably apply to a LOT more breeds.