As a dog owner, I can tell you that our furry friends know their humans very well, and can read our moods, often offering comfort when we need it. So I expected that this video of an old man and his dog would bring a tear. But I wasn't ready for how deeply it touched me.

I'm not going to give anything away about this public service ad, because it would lessen the impact of the video. I just encourage you to watch it all the way to the end, and have a box of tissues nearby. You're going to need them. It's an incredibly powerful ad that will stay with you for a long time.

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