I buy my dog soup marrow bones at the grocery store. They should be large enough so you dog won't choke on them. Also, they should not have small pieces they can break off (choke hazard also). After he eats the marrow out of the bone, I fill them with canned dog food and freeze them. They can be filled and frozen many times! My dog loves these treats, especially on a hot day. It keeps him busy for a long time!
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