your strength is increased by +2 and your charisma by +1

You age faster than humans and most fey races. 1 year to a human is 2 to you. example if a human is 10 you would be 20

You are a product of your environment where most corgi-men fall towards the chaotic neutral side you may vary as much as any other creature. 

you are size small due to being part corgi and they are not known for their height. your size is small

however you do believe your bigger than most creatures you see since most corgi-men suffer from little dog syndrome. 

You can see in dim light within 60ft as if it were bright light and darkness as if it were dim light, you cannot discern colour in darkness, only shades of grey.

by saying a phrase you can transform into the animal you are mixed/fused with. equipment will fall off you you keep your stats, but take the AC of the creature you become. 

due to your nature you have claws as a natural weapon you are proficient in. your claws do 1d4+str as slashing dmg

Due to your animal ancestry you have stronger senses of sight and smell giving you proficiency in perception checks.

Due to being so close to the fey wilds you have advantage against being charmed and magic cannot put you to sleep

You can speak, read, and write Common and lupin. you can talk to other dogs or similar creatures