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Aye, the wild is no place for gentle folk who can neither fight nor fend for themselves.
Dwalin was born in TA 2774. He is the brother of Balin and son of Fundin, and the cousin of Óin and Glóin. He is one of the 12 Dwarves accompanying his friend and King, Thorin Oakenshield, to reclaim their homeland, Lonely Mountain, from the dragon Smaug, joined by the wizard Gandalf and the Hobbit 'burglar' Bilbo Baggins.
After the Battle of the Five Armies, Dwalin lives in Erebor until he dies of old age.
Sir Peter Jackson's films
The Hobbit: An Unexpected Journey
Dwalin is the first dwarf to come to Bilbo's door. When Bilbo joins their quest, Dwalin joins the others in voicing skepticism that the mild-mannered Hobbit will survive in the wild.
When Bilbo is captured by trolls, Dwalin with the others rescue Bilbo. After all of the dwarves are put into sacks for the trolls to eat later, he was on the spit over the fire. Luckily, thanks to Bilbo stalling them, the Trolls all turn to stone with the sunrise. When the Troll hoard is discovered Dwalin accompanied Thorin, Gandalf, and a couple of dwarves invade it. His cousins Bofur and Nori bury the trolls' treasure to come back to later, a decision Dwalin disagrees with.
During the chase, Dwalin kills a warg with his axes. Later, In the Misty Mountains, after Thorin saves Bilbo, Dwalin helps Thorin find shelter. The company is captured by Goblins while Bilbo escapes, and Dwalin fights well while escaping with the others, killing the Great Goblin.
Even though the dwarves and Bilbo escape the Goblin Tunnels, Orc chieftain Azog the Defiler corners the Dwarves out of the forest. The trees start to fall, and Dwalin watches helplessly as Azog prepares to kill Thorin until Bilbo saves him at the last second. Dwalin eventually regains his footing and rushes in to defend Bilbo and save Thorin, with help from Fíli and Kíli. The company is then saved by a flock of eagles.
The Desolation of Smaug
Dwalin is seen next to Thorin and asks a returning Bilbo if the Wargs picked up their scent, which they hadn't done yet. All of them are driven to no other choice but to run to Beorn's house, travel through Mirkwood. In Mirkwood, Dwalin loses all of his possessions, including his weapons. Bilbo eventually saves them and helps them escape.
Dwalin openly distrusts Bard, the leader of the Men off Lake-Town, and suggests that they throw him overboard and take his boat by force. Dwalin is the first of the company to enter through the toilet and the plumbing system and Threatens to rip off Balin's arms if he speaks of this to anyone.
After Bilbo, Balin and Thorin discuss the day Smaug attacked Lonely Mountain, Balin says that their ancestor Thrór broke a scale off of Smaug's left breast, but Dwalin dismisses that as a myth. Their company is later brought before the Master of Laketown, and Dwalin presents Thorin as "This is Thorin, son of Thráin, son of Thrór."
When Bilbo awakens Smaug, Thorin rushes in to rescue him. Afterward, Dwalin, along with the other dwarves, storm into Bilbo's and Thorin's rescue before being chased off by Smaug.
The Battle of the Five Armies
Dwalin is first seen hugging his friends after they return from Laketown. Next, he is seen with Balin at his side, the dwarf king looking at the broken throne, and Bilbo standing behind/next to Thorin. The brothers report to Thorin that the Arkenstone has not been found, and even yells it. He spotted the Laketown survivors streaming into Dale and putting up a fortress by Thorin's orders.
Dwalin tells Thorin that Dáin is surrounded and that they are losing the battle, but Thorin refuses to listen. Dwalin accuses Thorin of having gone mad with power, but Thorin threatens to kill him if he does not leave. After Thorin comes to his senses, Dwalin follows his friend to finish the battle.
Dwalin tries to fight Azog, but Thorin stops him, knowing that he is no match for the Orc chieftain, and instead sends him to retrieve Fíli and Kíli. When the Goblin missionaries attack Bilbo, Dwalin rushes in to defend him.
After Thorin's death, Dwalin is shown mourning his friend and king. He later bids Bilbo an emotional goodbye, and Bilbo tells him that he is welcome to visit him at the Shire anytime.