Keen Hearing and Smell. The hound has advantage on Wisdom (Perception) checks that rely on hearing or smell.   Might of the Huntmaster. The following numbers increase by 1 when your proficiency bonus increases by 1: the hound's AC, its skill bonuses, and the bonuses to hit and damage of its Bite.   Pack Tactics. The hound has advantage on an attack roll against a creature if at least one of the hound's allies is within 5 feet of the creature and the ally isn't incapacitated.