Leave it for a day without feeding it it will run away
You can't but if you don't take care of it it will run away
You can sell your puffle on club penguin if you don't take care of him for a long time. That also includes no walking with your puffle that you want to sell.
You can actualy turn around then you say puffle I hate you run away. And it will run away then just buy another one. Or say you gay .bastard