its not "bloodlust" its prey drive, some dogs have more then others, terriers have a lot of it, they were BRED to grab a hold of other ANIMALS, not people. herding breeds also have a lot of prey drive, they are not known to attack other animals because there are 2 parts to the instinct, there is stalk and kill. the herding breeds were had the "kill" part muted, but that doesnt mean it doesnt crop up here and there. hunting breed simpley have the kill drive controled since the owner is supposed to do the killing lol in pretty much every other breed the stalk and kill instinct is still there, it is up the the breeders to mute it, by BYBs and PMs dont care so there are a lot of dogs out there of many differnt breeds with exactly the same instict as pitties. these insticts apply to other animals, the dogs would have been pretty usless if the stalk and kill instict was bred in for attacking humans.