When my puppy gets a hold of something, she will not give it up. It's not so much a problem with bigger things, but little pieces of plastic, rubber bands, anything that will fit nicely into her mouth. She has jaws of steel and finds my pitiful attemps to retrieve the small objects fun and enjoyable, like a game. I've tried trading her a treat or a bone, even another toy but she just swollows what she has. What should I do? Is there anything I can do?