Mutt

Mutt is the leader of the Pack, Sanctuary's hunting party and protection. Mutt found himself lost and alone, wandering Sorneith without a family. He came across Stray and Hound, who had found each other in similar situations, and together they formed the Pack. They roamed for decades together and developed a familial bond. Now, they couldn't imagine life without each other.
The Pack was travelling through the Ashfall Waste when they stumbled upon Sanctuary, who offered a place to stay for a while. They accepted the offer and, during their stay, discovered that Sanctuary had no protection either in the city or contracted from outside of it. The Pack offered their protection in exchange for a permanent space to live in the city, and they've been protecting Sanctuary since.
Though he's made friends with the residents of Sanctuary (and even found a mate - the Pediatrician Flaumello), the dragons most dear to Mutt will always be his Pack.

Mutt is a younger dragon, only a century or two old. He's stubborn and once he gets something in his head, it's impossible for anyone to talk him out of it. Most of this fierce bull-headedness is funnelled into protecting his Pack and Sanctuary. He's aggressively protective of the dragons he loves and is quick to jump to their defense, either with his talons and teeth or sharp tongue. The Pack respects him, but doesn't place him on a pedestal. Stray and Hound treat him like a brother, with love and a healthy amount of teasing.