Dreaming about dinosaur denotes expired outlook into old situations. To encounter a dinosaur, when you are dreaming, is suggestion that you may need to discard your old ways of thinking. Do you have old habits, that you want to get rid off? Dreaming that you are being chased by a dinosaur, shows the way to or the direction of your fears of no longer being needed or useful. On the other hand, there can be different explanation, being chased by a dinosaur, may reflect old problems that are still coming back. Are you haunted by old issues?
Dream dictionary: Dinosaur dream meanings
The dinosaur in dreams is the symbol of power and primitive instincts the dreamer has.