Testing the unbreakable bond between a human and his/her dog is among the top three ways to get viewers to cry during a movie. From coming of age tales like Old Yeller to action movies like I Am Legend, a canine companion's death hurts like nothing else.

And why is that? Viewers can watch humans die in the most horrific ways without blinking. But off a German Shepherd and everything breaks. Chew on that for a second.

Keep track of your feelings as you take in The 25 Most Traumatic Dog Deaths in Movies.

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Written by Frazier Tharpe (@The_SummerMan)