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ses playing where their interactions lasted at least 30 seconds. They analyzed (the videos,looking for specific patterns of play. They found that while playing,both dogs and horses often had relaxed and open mouths.Some also copied each other's movements,like pretending to bite,playing with an object,or rolling on their backs on the ground.The team also found that the dogs and horses copied each other's facial expressions.This behavior has never been recorded between animals of different species. "It's an important study because it shows how two animals who look and behave so differently can manage to decide how to play in a way that's comfortable for both,said Barbara Smuts,