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Hello. Thanks for writing in. My name is***** and I would be happy to help you. It is possible that he has a primary gastrointestinal problem, but with your description and his breed, I would be very concerned that he has herniated disk in his back. With his mobility declining and back legs failing, there is most likely some compression on the spinal cord. If that is the case, he is probably not defecating because it is painful for him to get into position. That can lead to a fecal impaction as well. My best advice would be to get him into a vet ASAP. If he gets to a point where he cannot walk at all or has no feeling in his rear limbs, then he can become permanently paralyzed if surgery is not performed to relieve the compression. If he is treated with some medications now, you may be able to avoid that. Please let me know if you have any other questions or concerns. Hope this helps.
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