[shilala]

Feral dogs absolutely kill for the sake of killing. So do neighbor dogs when they get out and pack up. I've lost lots of birds to dog attacks, they'll kill everything they can get ahold of.
Fox are different. They'll kill a small group, eat niblets, then take their meal to high ground to eat. It's like they just want to taste stuff until they get the right dinner.
Fortunately, they're all inherently greedy.
A guinea hen or three in a wire cage at night will bring everything from a hundred miles.
Done deal.