The Dog has advantage on Wisdom (Perception) checks that rely on hearing or smell.

Dogs have a powerful bite rather than a traditional unarmed attack. They are naturally proficient. Biting a target deals 1d4 + your Strength modifier in damage. When you bite a target, they must succeed a Strength saving throw (DC 10 + your STR modifier) or be knocked prone.

Dogs do not have sapience, therefore cannot naturally possess high intelligence. A dog's intelligence score is naturally 4.

The dog has advantage on an attack roll against a creature if at least one of the wolf's allies is within 5 ft. of the creature and the ally isn't incapacitated.

With their doggish charm, dogs gain +2 to their Charisma.

As creatures with no arms or hands, dogs cannot equip weapons. For sake of transporting items, Dogs can grip things with their mouth; whether any given item would fit into the Dog's mouth is at the DM's discretion.