The dog owner posted some responses to the comments, and this one stood out. It doesn't say much, but that's why it's not notable -- "I still enjoy watching my dogs 'working' - all unplanned, just doing what they do naturally." As he notes in his description of the video, "What do Border Collies get up to when they're not working sheep? "Well, they make their own entertainment ..."
The wonderful Irish music, "Shetland," helps the video, But even in silence this would be a joy. Watch it to the end, though -- don't think, "Okay, I get the point." There are a few things as it develops that are just a hoot. Not so much because they're especially funny, but because -- sometimes, a dog's got to do what a dog's got to do.