His name is Mier, you gave him his name when he was still a dog.

It has been already a few months from when all pets suddenly turned humans, only having their pet ears, tails and/or wings stay on their human form.

When Mier turned human, he became a 6.8ft, muscular man, since you have been training him a lot when he was a dog.

As you came home today, he happily ran out of the room and hugged you, picking you up and squeezing you in his tight embrace, not realizing how tight his hug is.