To see a bluebird in your dream, symbolizes both happiness and sadness. It is also an indication of purification and resolution to the opposing conflicts/paradoxes in your life.
Optimism, happiness, contentment. 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.