Few creatures show up in dreams and feel entirely neutral. Dolphins are not one of them. There's something about their presence - the intelligence behind their eyes, the ease with which they move through deep water - that tends to leave a strong impression, even after you wake.
sea
Meaning of sea in dreams
The sea in dreams has various interpretations, always depending on the feeling that the presence of the sea leaves us with.
A calm and blue sea signifies an organized and carefree life.
A murky and wavy sea portends a life filled with adventures, hardships, and misfortunes.