The German Shepherd wanted to drink some water so he went to the thin stream that was in the side of a road. But there was a problem: the water began flowing faster and faster.
The logic reaction would be to try to drink from the flow itself, though it could get a bit complicated. But the dog had a different approach: he tried to stop the stream with his paws.
Like The Ingenious Gentleman Don Quixote of La Mancha, who tried to beat giant windmills as if they were monsters, the dog tried once and again to defeat the stream. Of course, he was inevitably defeated.