A lot of people let's their dogs loose and they can hurt a kid in a bike or a jogger, or even a stranger. A pack of dogs can do much worse.
While most dogs dont attack, some do.
In my personal opinion La Perrera should pick them all up and severely fine the owners when they show up to claim them.
If not they should be treated and be put for adoption after the adopter signs a piece of paper that states their responsibility as an owner.
Wild dogs do nobody any good no mater how nice they are at fiirst, sooner or later the survival instinct will kick in and they can become dangerous to kids and the elderly, but that is just my opinion.
Victims should suit the town when somebody is hurt, then we will see the towns take care of the problem instead of looking the other way.