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Hello, this is Dr. Jess. I am very sorry to hear about your pup! Given your description, the safest thing to do for him would be to get him in to your vet for an exam. We want to be sure this is just a case of constipation and not also an inestinal blockage, which can become life threatening if it goes untreated. Your vet can perform an exam, a rectal exam, and take an x-ray if needed to ensure there isn't a problem other than the constipation. If it is constipation alone, they can then give some fluids to help hydrate your dog and aid in the stool becoming softer, prescribe a laxative such as laxatone, and in some cases perform an enema. Truly, in his case, with a history of bone ingestion and lethargy, a visit to the vet is needed.
We normally don't recommend having owners give enemas at home because we want to be sure there isn't another issue (inestinal obstruction), we want to be sure we can't feel sharp bone fragments that could cause issues on the way out, and we often need to rehydrate them with some fluids before or at the time of giving an enema. An enema may be needed, but the safest thing to do is to have your vet check him out and perform one if needed.