Sharks occupy a specific niche in dream symbolism distinct from other predators: the threat is largely submerged, unseen until it's close — which usually points to a danger you've underestimated or haven't fully registered yet.
Being chased or hunted by a shark
This most common version tends to reflect a threat — professional, financial, or relational — that you sense is present but haven't been able to fully assess, something operating mostly out of view.
Swimming and spotting a shark in the distance
A version with more warning built in, this often reflects early awareness of a risk before it's become acute — worth paying attention to since your subconscious may be ahead of your conscious assessment.
A shark attacking someone else
Can reflect concern for another person facing a hidden risk, or — if that person represents a role or relationship — a sense that a specific area of your life is under threat in a way that isn't obvious yet.