Here's a few dog ears in a 2011 paper about the boar in European mythology by Lenka Kovárová.
The paper is Norse-centric in its focus, but it offers a detailed account of the history's history of boar in mythology.
It's easy to see why wild boars would both be reviled as destructive force and esteemed as proliferous one. This duality is a common theme in Europe at this time. The boar is again a subject of this duality in the brother-sister, night and day gods who are associated with it: Freyr and Freyja or Apollo and Selene.
I've picked out several sections from this thesis that are especially interesting:
Section 2.1.4. "The Warrior’s Equipment"
Section 3.2.2 "The Boar as the Sun Symbol"
Section 7.2 "Shape-changing"
Section 7.3.2 "Identification with a Boar: The Boar Warrior" AKA the úlfheðnar or berserkir
See also [here], [here], [here], [here], [here], [here], [here], [here]
Kovárová, Lenka, 1980- "The Swine in Old Nordic Religion and Worldview" (2011)