If it's the Warden, or the Warden-Commander: He has returned to your side after some time spent in the kennels in Denerim. Ferelden lost many of its war dogs during the Blight and kennel masters selected your prized hound to strengthen their packs. He has been mated with female hounds from all over Ferelden and has sired several litters of puppies. If the Warden never got a mabari in Origins: After your defeat of the archdemon, Teyrn Fergus Cousland of Highever presented you with a prized, purebred mabari hound. He has joined you on your hunt for Morrigan.