I got some raw beef bones and I am trying to give them to Rory to help with her teeth cleaning. She does not sit for hours and chew it up and finish it up. She only works at it for maybe 20 mins (if that) and she walks away. Can I put these back in the freezer and just give it back to her later? I'd hate to waste a good bone just tossing it. Once she's cleaned it completely, can I just leave the bone out in the yard with her to chew/play with without it going bad?