Your Charisma score increases by 2.

Fey Corgis are very short lived, usually about 16 years.  But hey, that's like 80 in dog years.

Most Fey Corgis tend to be Lawful Good.  Because they are all good boys.

Fey Corgis are typically 3' tall when standing on their hind legs and weigh in at about 25-38lbs.  Your size is small.

Your base walking speed is 25 feet on two legs and 35 feet on four.  You may only use four legs if your hands are free.

Your Fey heritage grants you the ability to see in the dark. You can see in dim light within 60 feet of you as if you were in bright light, and in darkness as if it were dim light.  You can't discern color in darkness, only shades of grey.

You have advantage on saving throws against being frightened and magic cannot put you to sleep.

You have the ability to wield any one-handed weapon that you are proficient with in your mouth and any shield on your back while still gaining the benefits.  While fighting this way you may only attack once during your attack action.  You also gain proficiency with simple and martial one-handed weapons and shields.

Unarmed melee attacks require your mouth to be free and deal piercing damage instead of bludgeoning.

You are proficient in the Perception and have advantage on saving throws to hear or smell things.

You can speak, read, and write Common and Sylvan.  You can also communicate with canines through a series of barks and gestures.

The Fey Corgi has two subraces; The Valiant Cardigan and the Mystic Pembroke.  Choose one of these subraces.