Dogs never attack without a reason! They only do it when they feel threatened, and there is no sight sadder than a dog who feels threatened, a dog who is scared. When Sassy was rescued she was so frightened of humans that she would defecate whenever anyone would get close to her.
She had spent her entire life far from humans, so she was basically feral. Training her to accept humans was not an easy task, but fortunately the result was wonderful. You have to see this beauty!