I'm a blooming nuisance posting about bones! Well today, I went to the butchers and he gave me a big bag of bones. I don't know what animal they are from but I assume beef? One is a knuckle bone? Sealed at both ends. Some look like ribs? And some have a knuckle at one end but then go fatter further down but are open with gunge inside - YUK! Are these safe to give a little Cavalier??........I'm not convinced. The knuckle bone looks ok but there's only one and I cant give one dog without the other.
The gunge, is marrow, and dogs love it, and yes perfectly safe to give to a Cavalier.. I would suggest, that you restrict how much marrow he gets, as it is very fatty, (maybe scoop some out with a spoon, and save for later :-)