Birds, in general, are used spiritually to convey messages. These messages can range from being a beacon of hope and inspiration to warnings and guidance.
We each receive spiritual messages in our own unique way and Universal energies are very much aware of how it will be interpreted by you. For some people, the white dove will have specific connotations, whereas for other a black raven will mean something else. For some, it means nothing at all. It must be remembered that the way doves are perceived has been created culturally by us, it is us who attach specific meanings to birds, animals etc.
The spirit realm works with who you are and where you are in terms of your spiritual development.