please be not a wolf (aka fenrir) nor slime.
Those are overused.
They can be fluffy, feathery or scally, but do not use the overused animal/monster companions tropes
Maybe, or it could be some misdirection by the mangaka. Make the lord look a little suspicious and have him seem dismissive while in reality he dismissed him so he could talk with him without the obvious con-artists and opportunists present. He didn't tell him to leave, just to withdraw for now.