Hello Jennifer Welcome to the list. Lots of great and very passionate Berner owners here with loads of good information.
Beef knuckle bones would serve two purpose's, give him something to chew on helping with his need to chew and help keep his teeth tartar free. We also buy the rack of beef ribs when they are on sale cutting them into individual ribs and keep the extra in the freezer. Of course there are not many extra when you have four adult Berners. The also get some calcium from the bones .. We do not feed any extra calcium other than what they get from bones. The dogs love those and of course with any bones one wants to watch them and maybe confine them to a non carpeted area till they get the bone cleaned off some. Ours get the bones outside and will spend hours working on them. I will knock on wood and keep my fingers crossed as I say this, but we have never had a problem of any kind from the Bones. well maybe a soft stool if there is to much fat on them. Ray & Pat Burgett Eaglecap Bernese Talee,Lexi,Boomer,Bell & Max www.goodbernerfood.com http://users.eoni.com/~eaglecap/ Draminski Ovulation Detector Rep
