A child is about to reach into a stream to retrieve a ball, but the dog behind her knows it’s dangerous. As a video posted on Twitter shows, the dog prevents her, even if a little unceremoniously, from risking her life.

Not surprisingly, social media cannot have enough of the video, which is being retweeted in huge numbers, and has led to a stream of comments (one of which asks, perhaps pertinently, where the parents are).