Blood craze....lol. No such thing. I always have a pack of house dogs (rescues of various breeds and usually protection dogs too) and sometimes blood happens, a dog gets injured, or I get injured and bleed all over the place. They lap up the blood (especially mine) but there is no such thing as a "blood craze" and they have yet to try to eat me because of it! Having said that I wouldn't have the dogs witness chicken killings. Too much excitement and honestly it sends the WRONG message to them. I would worry it will upset them OR they might think since you are doing it then it must be okay and they can do it too, ya know? Dogs are smart.