To see a mountain lion in your dream, represents lurking danger, aggression and raw emotions. You need to keep your attitude and emotions in check. Alternatively, mountain lions symbolize pride and grace.
Strength in action (especially through stealth), and personal power. Decisiveness, the attitude of "act now, think later." Extremely in touch with basic instincts. Smooth in action and capable, with an edge of danger. Dreaming of this animal can represent:
Having too much of one of these qualities, or that you could benefit by being less this way
Not having enough of one of these qualities, or that you could benefit by being more like this
Someone or something in your real life with whom you associate one of these qualities (an event, situation, threat, etc.)
For more clues, pay attention to what the animal was doing or any particular characteristic that stood out.