Dog attacks are always a tragedy. More often than not children or other animals are the victims and often the result is severe.
That said, it is usually a sad situation for the owners as their pets are often seized and can be put down. There is also the guilt of knowing your pet badly injured someone.
Attacks always spark debate about who is at fault. I don't think there is a straightforward answer. Every attack is different.
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Sometimes the dog has been provoked, sometimes it has not been trained or raised well and sometimes it seems that something just snaps and a usually friendly dog becomes aggressive. That said, I believe it is the responsibility of the dog owner to keep their pet securely fenced in and under control. If walking it off a lead in a public place, extreme care needs to be taken.