Multiattack

The lich hound can use its Eerie Howl. It then makes two Bite attacks. If both attacks hit one creature, the target must succeed on a DC 14 Constitution saving throw or take 7 (2d6) slashing damage and be incapacitated until the end of its next turn.

Bite

Melee Weapon Attack: +6 to hit, reach 5 ft., one target. Hit: 11 (2d6 + 4) piercing damage. If the target is a creature, it must succeed on a DC 14 Strength saving throw or be knocked prone.

Eerie Howl

The lich hound releases an eerie howl that fades in and out and echoes strangely. Each creature within 30 feet of the lich hound must succeed on a DC 14 Wisdom saving throw or be frightened for 1 minute. A creature can repeat the saving throw at the end of each of its turns, ending the effect on itself on a success. If a creature's saving throw is successful or the effect ends for it, the creature is immune to the lich hound's Eerie Howl for the next 24 hours.