If you do wind up taking any of the dogs/pups to Animal Control, make sure they know the dogs have attacked/killed your chickens. Around here, if a dog kills another animal, the owner is charged with having a vicious animal, and the dog can be declared various levels of dangerous, meaning the owner MUST keep the animal contained in very specific fenced enclosures or inside, and can only walk the dog with a muzzel, etc. and is sublect to inspection. Also, the owner will be charged to reclaim the animal from the shelter. Good Luck!