Wardhound
Wardhounds are teleporting fey canids that came through The Rift with the Menagerie. The name comes from the job they have drifted into: packs are kept to help guard warded enclaves, blinking across a perimeter to run down anyone who slips inside. The Nawadzi School for Forgotten Folk keeps a pack on the valley's outer slopes for exactly that.
Statblock
Mechanically a reskinned Blink Dog. Run it straight from the SRD; only the name and flavor change.
Medium fey lawful good
Armor Class 13
Hit Points 22 (4d8 + 4)
Speed 40 ft.
Skills Perception +3, Stealth +5
Senses passive Perception 13
Languages understands Sylvan but can't speak it
Challenge 1/4
Keen Hearing and Smell. The wardhound has advantage on Wisdom (Perception) checks that rely on hearing or smell.
Actions
Bite. Melee Weapon Attack: +3 to hit, reach 5 ft., one target. Hit: 4 ( + 1) piercing damage.
Teleport (Recharge 4-6). The wardhound magically teleports, along with any equipment it is wearing or carrying, up to 40 feet to an unoccupied space it can see. Before or after teleporting, it can make one bite attack.