Dain's boar

Dain’s Boar, first appeared in The Hobbit: The Battle of the Five Armies, the Dwarven king Dain II Ironfoot arrives in the Lonely Mountain astride his boar. When Dain arrives in Lonely Mountain for battle, it accompanied his master throughout the ordeal at the gates of Erebor. It is later seen assisting Dain when the war broke out. It is killed when an orcish spear pierced its head, as his master was dueling two other orcs. Dain can only continue the battle on foot. Later, Dain immediately use his war-hammer to smash the orc who killed his boar, as a revenge.

Trivia

 * It died along with Thranduil's elk, signifies the loyalty of the animals and the closer relationship between Dwarves and Elves.