White Dog (1982) on Netflix

In Los Angeles, the unemployed young actress Julie Sawyer hits a white German Sheppard while driving though the hills during the night. She brings the dog to the veterinary and keeps the animal in her house on the hills. Julie takes a picture of the dog and distributes fliers with her boyfriend seeking out the owner. When a burglar and rapist breaks in her house, the dog protects Julie and she decides to keep the animal with her. But sooner she learns the white dog is an animal trained by a racist to attack black people. However Julie has become attached to the dog and tries to find a trainer for "deprogramming" the dog. She goes to the Noah Ark, a place where the Afro-American trainer of wild animals Keys accepts the challenge despite the difficulties of his task.