A. If he is having difficulty passing stools he could be impacted from a large volume of bone dust/gravel texture but I would be very cautious he may actually be obstructed from a single large piece of bone which can become a life-threatening emergency. If this is more than 48hours since he ate the bone he should be assessed by a vet as soon as possible as damage can rapidly occur to the gut lining. If he ate it yesterday some medical grade liquid parafin or cat laxative paste (1 tube) may help to lubricate and allow him to pass this nut it can complicate surgery if it does not work. My advise would be to get him examined and possibly x-rayed and your vet can then discuss the benefits and risks of both medical and surgical remedies
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