I'm sorry that your question wasn't answered in a timely manner. Please let me know if you still need help. Panting, pacing, and whimpering can indicate intractable pain but also encephalopathy (brain disorder) affecting the forebrain - cerebrum and thalamus. This isn't going too show up in blood tests or a regular physical examination. Instead, a careful neurologic examination may reveal a change in mentation (mental status) and behaviors typical of such a disorder. A specialist neurologist is likely to recommend MRI which I would find inappropriate at his age. Instead, I'm more likely to see how a psychotherapeutic drug or anticonvulsive drug affected him. Unfortunately, brain tumor would top my differential diagnosis list for such behavior.
Please respond with further questions or concerns if you wish.
Thank you for your kind accept. I appreciate it. I can't set a follow-up in this venue so please return to our conversation - even after rating - with an update at your convenience. You can bookmark this page for ease of return.