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First open his mouth and make sure that there isn't a bone fragment lodged crossways in the roof of his mouth. All you need to do is remove it. Have someone hold him while you use a pair of pliers to dislodge it. It'll bleed for a little while.
If that is not the situation, then your dog is in an real emergency situation It is the same as if your child were coughing up blood. You would call 911.
If bone fragments are lacerating his stomach or intestines or worse, lodged
somewhere in his gut he may continue to hemorrhage.