A Daedra's Best Friend

Background
"I ran into a talking dog named Barbas who had a falling out with his master Clavicus Vile. Clavicus has agreed to take Barbas back if Barbas and I retrieve the Rueful Axe."

- The Dragonborn

Quick Walkthrough

 * 1) Find Barbas the Dog near Falkreath, the meat given to the Dragonborn by Lod is not necessary to lure him.
 * 2) Follow Barbas to the shrine of Clavicus Vile in Haemar's Shame. Be prepared to fight a host of vampires and thralls once inside. Talk to the Daedra by activating the statue; choose "reunite the dog" as your wish.
 * 3) Retrieve the Rueful Axe for Clavicus Vile in Rimerock Barrow. A named mage, Sebastian Lort, will need to be killed, but there is not much resistance otherwise.
 * 4) Return to the shrine of Clavicus Vile.
 * 5) Kill Barbas to keep the Rueful Axe OR refuse and wait until dialogue completes to retrieve Clavicus Vile's Masque (Daedra Artifact needed for achievement/Trophy).
 * 6) The quest is over at this point, but the player still may return to Lod for a small reward (25 gold) by telling him "The dog was more trouble than he was worth".
 * [v=MAhC5J2AlPM|Detailed video guide]

Bugs

 * If you address Barbas during the final dialogue, he does not join the shrine and you do not get the Masque.
 * Talking to Barbas for the first time while having cleared 49 dungeons will sometimes grant you Delver achievement