Unlike sharks or other water predators, dolphins carry an almost entirely positive charge in dream symbolism — intelligence, playfulness, and an easy relationship with emotion (water).
Swimming with dolphins
This common, pleasant version often appears during a period when you're navigating your emotions with more ease than usual — processing feelings without being overwhelmed by them, the way a dolphin moves through water without struggle.
A dolphin communicating or guiding you
Dolphins leading or guiding you in a dream can reflect a trust in your own emotional intelligence — a sense that you know, intuitively, how to handle a situation even without a fully logical plan.
An injured or stranded dolphin
A more distressing variation, this can reflect a fear that your usual emotional ease or resilience is currently compromised — feeling less able to "go with the flow" than you normally would.