Thanks so much guys, doberluv, yes the marrow bones are the ones with the hole in them. I wasn't home and my mom said she even asked my dad because she wasn't sure she should give it to her (she had no idea to worry about the hole, but she was worried it might be a weight bearing bone, and they can chip their teeth) and they both came to the conclusion that it would be safe. They had no idea that could happen (wish I had been home) but thankfully all ended well and she won't be getting one again.