Help! I have just returned from a walk, during which my 4 year old black bitch purebred lab chased, caught and killed and tore apart a small deer. She has always brought me only dead animals nearly dead animals in the past and has always dropped them when asked. Her recall is kinda ok with a whistle. I've never seen this savage behaviour in her before and we have had her from a puppy. I take her 'hunt' training with dummies and play hide and seek with her toys at home to satisfy her hunting instinct. This episode has left me really shaken. Is muzzling the only solution?