I mean it when I say this video will probably have you in tears at first. But there's a real happy ending, I promise!

In this amazing video, a Good Samaritan stranger offers CPR to a woman's dog, who passed out and stopped breathing while on a walk.

The man slowly breathes life back into 'Sugar' by performing dog CPR. Sugar hops back up in ball of happy energy at 2:30 in the video, in case the whole thing gets too hard for you to watch. (I know it did for me!)

And yes, for those of you who want to know, dog CPR is a technique you can easily learn, in case you find yourself in a similar situation.

As for the saintly stranger who breathed life back into Sugar--on behalf of all dog lovers, we think think he deserves a medal.