This is my only and first snake, so I don't have access to getting something mouse scented. I could go to frozen mice first then to rats, but maybe this extra week will make him extra hungry so might not be as picky too. At first he seemed to be in strike posture but gradually went to almost a more fearful posture. I didn't want to create extra stress so I didn't keep putting it in front of him once he hissed a little. Is it possible he saw the rat as too big? I mean he has fed well and has steadily gained weight every week, so maybe the rat pup wasn't the right size choice.