Blackhound

Keen Hearing and Smell. The Blackhoundhas advantage on Wisdom (Perception) checks that rely on hearing or smell.

Pack Tactics. The Blackhound has advantage on attack rolls against a creature if at least one of the Blackhound's allies is within 5 feet of the creature and the ally isn't (Incapacitated).

Pounce. If the Blackhound moves at least 20 feet straight toward a creature and then hits it with a Bite attack on the same turn, that target must succeed on a DC 13 Strength saving throw or be knocked (Prone). If the target is (Prone), the Blackhound can make one bite attack against it as a bonus action.

Bite. Melee Weapon Attack: +2 to hit, reach 5 ft., one target. Hit: 7 (2d4 + 3) piercing damage. If the target is a creature, it must succeed on a DC 12 Strength saving throw or be knocked prone.