In this Tuesday, March 12, 2019 photo Puppy raiser for Guide Dogs of America Lexie Dreyfuss and her 6 month old Labrador Retriever Hathi prepare for a demonstration at the California Science Center in Los Angeles. A new exhibit at a Los Angeles museum examines the relationship between dogs and humans and explores why the two species seem to think so much alike and get along so well. "Dogs! A Science Tail” opens Saturday, March 16, 2019, at the California Science Center. (AP Photo/Richard Vogel)
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