A tiger dream symbolizes great power and authority. Riding a tiger and galloping is a lucky dream meaning rising to a high position or gaining power. Being chased by a tiger represents conflict with an authoritative person or strong pressure. Catching a tiger predicts defeating a strong enemy or competitor.
Animals appearing in dreams — as in "Tiger 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?