I watched Gene Kelly for his smile for his energy. Vittorio Gassman for his movement. Clark Gable for his mustache. And I watched Lassie who was happy as a dog.
Ever since 'Lassie' and 'Old Yeller' I won't watch animal movies. Animals in movies always die.
I've always been an animal lover. I've grown up with dogs my whole life. I think that is what helped me get the role on 'Lassie' I was comfortable around the dog where many of the kids were afraid or intimidated by Lassie.