At a job site some years ago I met someone with two Border Collies who were frantic. They were running around as though they were having an anxiety attack, looking for anything they could make move. The first time I saw them focus on anything was when an airplane flew past. And the dogs tried to herd it, too. The fact that the airplane did not comply with their direction appeared to add to their distress.
I asked the owner what was happening and he replied, "Oh, that's just the way they are, they're a little crazy."