The Dolphin is the keeper of the sacred breath life, and teaches us how to release emotions. We can breathe (for me take the breathe down to where it needs to be) and breathe out, helping us to release stress, pain, worry, etc., it is a good way to connect with divine energy coming from the Great Spirit.
Breathe and allow the life forces to rejuvenate you and let go of anything that blocks you for life's flow, let go of barriers that prevent you from connecting you to the Creator, the God of your understanding.
If you don't breathe in life's force, starving your body mind and spirit and not giving it the food it needs.
The Dolphin means manna according to Jamie Sams. I take that as life giving force, like the story in the New Testament, who God sent it from heaven to feed the people.
When we try to control, we are denying ourselves and blocking ourselves from God's Grace and we limit our God as to what He can do for us. When we only let certain things to enter our lives, the blessings, gifts, and clarity of inner knowing, enlightenment, and lessons in life may pass us by.