Like most animals, its symbolic meaning is versatile. On one side, it represent intrepidity and irrational bravery; on the other, it is a symbol of a lack of restraint. Given that it is difficult to fight the boar (he never gives up), the dream is indicating that if you repress your desires, your instincts will make your life impossible. Using the strength of the boar, you will be able to attain all that you wish. It represents free sexual impulse, not controlled by the conscious; that is, the libido, which is like the boar, is uncontrollable, violent, and irrational.
As a negative symbol, the boar represents the oneiric personification of cruel and ruthless enemies.
If in the dream the boar is captured or conquered, it portends joy and triumph.... The Big Dictionary of Dreams
From time immemorial, people have used dreams in ways that benefited their waking lives. The more you learn to interact with your dream world, the more you integrate your total personality. Truly, this is a realm of magic and mystery, but one well worth exploring. Those who go fearlessly into the caverns of the night can return with untold treasure—and, intrepid explorers all, discover new territory in the vast, as-yet-unexplored continent of the human mind.... Dreampedia