Dream about riding a horse fast is an indication for some pent up anger. You are trying to communicate your feelings and your need for contact. You are subconsciously picking up hints and cues that your significant other is not being completely truthful or is not fully committed in the relationship. The dream means your primal fears and feelings of falling into a pit of despair. You are leaving too much to chance.
Riding a horse fast dream is a harbinger for your worries over minor problems and small matters. You may feel that you are not able to fully express your emotions. You are trying to suppress your desires for independence. This signals your pessimistic outlook in life. You are too yielding to others or that you are too submissive in some situation.
If you dreamt about riding a horse fast:
You may have realized that certain beliefs or attitudes that you have held relate more to the past than to your present situation, and you are now prepared to do something about this. Although things may not improve overnight, making a start will bring about a significant difference.