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Have you noticed any change in his appetite? Any change in his amount of thirst or urination?
I can see your response now. Based on your description, it sounds like he is more withdrawn/lethargic, has behavior changes (vocalization), and a decreased appetite. It is likely that he has a metabolic problem (such as renal disease, liver disease, or pancreatitis) rather than a simple behavioral issue.
I highly recommend getting him to your local vet as soon as possible. I would start with a physical exam and blood work. This may be enough to diagnose his condition so that we can begin a targeted treatment plan. Please let me know if you have further questions. I am happy to continue until I provide the service that you seek.