Street food in Barcelona
The Policía Nacional have announced that malicious person or persons are leaving salchichas with needles imbedded in them in all the parks around the city. This seems to be aimed at maiming or killing dogs.
Separately to this, I have also heard of reports of food laced with poison being left out in the parks.
Dogs are natural scavengers and so it is in their best interest not to allow them to eat food off of the ground.