This is another cause of obstruction in the bowels to which dogs are peculiarly liable. Pieces of bone are swallowed of such size and substance that they pass through the digestive organs very slightly diminished, and getting into the smaller intestines, cannot pass farther, so that feces accumulate and harden until, if not relieved, inflammation is set up. Sometimes stones are swallowed and cause obstruction, and this will at once demonstrate the danger of throwing stones for dogs to retrieve, for, in their eagerness, they are apt to swallow them, especially if small. Wool or rabbit fur swallowed is likely to ball together with other matter. See Obstruction of Bowels.