You were a dog, well, a wolf to be exact and somehow you were tamed enough to become a person’s fluffy companion but not just any person. An angel who’s name was Castiel

Castiel found you in the woods, caught in a wolf trap and wounded. He took you in but it took awhile to gain your trust but it all worked out. Castiel brings you everywhere with him and you’ve proved to be very helpful on cases as well with your cunning skills and sharp canines, etc.