I have a st bernard puppy about 6 months old. We live on a farm with ducks and chickens and cats. Lately my puppy has been attacking the ducks and chickens she had already had the taste of blood and I have no idea on how to dicipline her to get her to stop hurting them. I don't want to get rid of her but it's getting out of hand she killed 2 ducks and 1 chicken I don't know how to stop it! Please I need help!!!