A turtle dream is a lucky symbol of longevity, patience, and wisdom. A turtle entering your home means longevity and blessings entering the household. Riding a turtle's back hints at a long-held dream slowly coming true. A turtle laying eggs predicts the long-awaited fruits of effort appearing.
Animals appearing in dreams — as in "Turtle Dream" — often symbolize instinct or a suppressed impulse in Jung's theory of Archetypes. The specific animal and the emotion it evokes in you both shape the meaning far more than a generic dream dictionary entry can.
What was the first emotion you felt when you saw that animal in the dream?