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The science behind therapy dogs isn't there

Richard Drew / AP

The efficacy of therapy animals — a mental health trend seen everywhere from airplanes to college campuses — isn't totally backed up by scientific research, per The Washington Post.

The problem: The research around the topic is relatively scarce and prone to cherry-picking, thanks to small sample sizes or poor, if any, control groups. It's particularly difficult to isolate if a person's lower anxiety levels are due to proximity to an animal or any number of other reasons associated with caring for it.