When I was young , a long long time ago, I lived on a council estate and there was usually a pack of dogs running round the estate during the day. It was the practice for people to put their dogs out in the morning, let them run round loose all day, and then they would go home in the evening. Things were particularly intense when there was a bitch on heat.
As a child I found this quite frightening. But the amazing thing was you never heard in those days of people being attacked by dogs. Perhaps the very occasional dog bite but even that was rare.
So.something has radically changed to make dogs become the potential and actual killers that they are now.
This is extremely near to my heart because I grew up.a few streets away from the recent horrible fatality in Redcar. I moved away from the area many many years ago but it would have been inconceivable in my childhood for this awful thing to have happened despite all the dogs on the loose in the streets then.