Corgo

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

Damage Resistance. The corgo has resistance to fire damage.

Bite. Melee Weapon Attack: +4 to hit, reach 5 ft., one target. Hit: 7 (2d4 + 2) piercing damage. If the target is a creature, it must succeed on a DC 11 Strength saving throw or be knocked prone.

Breath Weapon Attack (Recharge 6). The Corgo uses its breath weapon attack.
Small Firebolt. The dragon shoots a ball of fire from its mouth with a 20-foot range that is 5 feet wide and has a blast-radius of 5 feet. Each creature in that radius must make a DC 11 Dexterity saving throw, taking 8 (2d6) fire damage on a failed save, or half as much damage on a successful one.