White Dog

Julie Sawyer, an actress, hits a handsome white dog with her car one night and then nurses it back to health. One day, the theretofore mild-mannered dog saves her life by viciously attacking and a rapist who breaks into her home. At the studio whilst shooting, unexpected, the dog attacks one of Julie's friends, a black skinned actress. She discovers for the first time, that the dog has been trained to attack black skin.
She consults an animal trainer, Carruthers, who urges her to have the dog exterminated. A black trainer, Keys, who has tried before to break the training of such dogs but never succeeded, steps in. Everything seemed to end in great success – Keys shoots the dog whilst he was attacking (Caucasian) animal trainer Carruthers.