Make sure a police report was filed. I can't believe the ASPCA did nothing. I am not sure if there is anywhere else you can contact but did you all try calling 311 (for those not in NYC, that's the government info line for non-emergencies) and asking if there is any other agency you can report this incident to? If those dogs have a prior incident of biting, the owner can be in big trouble. I know this won't bring the poor yorkie back but the owner should sue. If nothing else, the case would register as an incident and should these dogs attack again, they can be dealt with. I am so sorry for your friend's loss.