So we got Skyy a bone today, but i've got a few questions as I've never given a bone before. What bones should/shouldn't give to him? What animal bones are no-nos? Once he's had it for a while can I put it in the fridge/freezer? If so how long can I keep returning it to him? He's 5 months old so don't think he'll get through one very quickly. Thanks in advance for the answers!