You can tell when an animal is stressed: The whites of its eyes show, the tail swishes, the head is up and ears pinned back, and it defecates more. It may balk, bolt or lash out.  People who work with animals, whether as veterinarians, trainers, facility or livestock managers, need to understand animals’ emotional response if they want the best outcomes, Temple Grandin told students and faculty at Tufts University’s Cummings School of Veterinary Medicine at a lunchtime lecture Tuesday. She is an internationally known designer of livestock facilities, professor of animal science at Colorado State University and autism activist.