[Cotons mom]

OK I have two cottons both a year old. I am really interested in giving them raw bones both for recreation and meals but am so afraid of them choking. The little guy is 10 pounds and his sister is 17 pounds. I feel them a raw diet (primal, S&C, and a few others) and give them frozen/defrosted tripe from vital essentials.

What animal size would be appropriate for them? and do I need to take the marrow out of the marrow bones to keep them from getting too much fat and then GI distress?

Thanks so much