The dog in the video watches from their front yard as his human sibling gets off the school bus and crosses the yard to get him.
The dog actually just walked, not ran. Perhaps he had a busy day of running around and chasing his tail and just needed to stretch his legs. On the other hand, the little one rushes up to him and greets him.
The dog subsequently does something that was most likely the cause of the leg stretching. He raises himself to his hind legs and embraces his friend. What a thoughtful gesture!
Furthermore, the dog refused to let go. What follows is truly heartbreaking. Take the time to view this video; it will benefit you greatly.