I watch a lot of 'dog reunited with family member who Went Away for A While' type videos (soldiers, oil rig guys, college kids coming home on break, etc). They tend to vary in length - most are about two minutes long or so - but there's a common formula. You get to see the dog, the person holding the camera walks-and-talks their way to a door, and then there's a shot of the excited and very happy dog jumping up on the delighted human and licking them in the face. You see the entire first burst of energy, where the dog seemingly can't believe Dad's home again, and then usually a few seconds after that. What's interesting to me is that a lot of them go to 3, even 4 minutes. Even though these are videos that have been uploaded to youtube willingly, watching them for too long can feel a little uncomfortable, or like I'm seeing something too intimate that I shouldn't be seeing - sometimes the person holding the camera will start talking to the person who's returned, about how their day was, while the dog plays excitedly.
It's weird to complain that watching home movies feels intimate, but seeing the insides of so many different peoples' homes feels like i've been invited to see something more private than usual because there's a happy dog attached to it. That's an interesting evolution in how we behave on the internet, anyway. imo.