You conjure a Shadow Mastiff from the plane of shadow. This creature obeys your verbal commands to aid you in battle or to seek out a specific creature. It has the body of a large dog with a smooth black coat, 2 feet high at the shoulder and weighing 200 pounds. The mastiff is friendly to you and your companions. Roll initiative for the mastiff; it acts on its own turn. It obeys simple, verbal commands from you, within its ability to act. Giving a command takes no action on your part. The mastiff disappears when it drops to 0 hit points or when the spell ends.