Justin Bieber has revived a viral video that's a real oldie-but-goodie.

A few years, an amazing video of a dog in Santiago, Chile who darted out into the middle of a busy highway to rescue a wounded pooch went viral. 

The video was buzzing again this morning, as a new generation of internet users discovered it for the first time thanks to the Biebs posting it on his Facebook page.

Even if you've seen it before, this extraordinary video is worth another look. Check it out below, and then go home and hug your dog.

[via Facebook]