Canis Major

Third year divergent: When Doctor Brianna Davis is given a job offer by Albus Dumbledore to go to Hogwarts to teach History of Magic AND protect Harry Potter she accepts with a bit of reluctance. Things get even more wacky when a hug black dog comes into her life that is smarter than the average mutt. As for Brianna? All she wanted to do was be normal. Eventual SiriusxOC.