Your post title reminded me of the time that my friend Bob dropped a duck that ended up floating in the middle of the River Cherwell above Oxford.

He sent in Toad (3/4 Labrador, 1/4 Collie) who rushed to the bank but then uncharacteristically locked on all 4 brakes at the edge.

Bob was about to shout at him when a Pike, invisible till then, and “the size of a field gatepost” rose to the surface, swallowed the duck and both disappeared.

How did the dog know what was about to happen?