This is the Border Collie stare 👀 When a Border Collie locks in, their pupils dilate to let in more light - allowing them to detect the tiniest flicker of movement in their surroundings. Pupil size is one of the clearest signs their herding instinct is fully activated. That stare isn’t random. When their pupils dilate, the brain releases a rush of dopamine - the same neurochemical that drives pleasure and motivation. It feels good to stare. That’s why Border Collies seek movement to fixate on a