Star Wars X-Wing: Hound's Tooth - Rules of Play says:

The Hound’s Tooth Expansion Pack brings this infamous freighter to life as a towering, large-base miniature starship for the Scum and Villainy faction. You’ll also find four YV-666 ship cards, a new mission, and thirteen upgrades, including the Hound’s Tooth Title, which allows your YV-666 pilot to survive imminent destruction by escaping aboard the Nashtah Pup, a unique Z-95 Headhunter (not included).