Gren

Gren is Harry's magic detecting dog. She was originally trained by Edmund Barber for use as a police dog, but Harry stole her from the station when she quit policework. "On her departure from the police, Harry was able to secure herself one fluffy bundle of magic-scenting German Shepherd. Greenwich (pronounced gren-itch) has been trained to the best of Harry's abilities, which is to say not very well at all. She can zero in on a particular spell with the ease and single-mindedness of a fully-trained police dog, but you shouldn't trust her alone with a Christmas ham. A fan of table scraps, scratches behind the ear, firesides and chasing wizards, Gren is Harry's best friend and most necessary tool of her trade."