Shaking and trembling are usually indications of pain, anxiety, or the anxiety associated with pain. We do see such behavior as part of partial seizures and Bisley's history of epilepsy shouldn't be discounted out of hand. If this is the case, the frequency of these events suggests clustering (more than one seizure within a 24 hour period) and this can presage status epilepticus - the state in which his brain remains over-excited and in those cases I need to heavily sedate or anesthetize my patient. Please consider having Bisley attended to by an on-call vet. He concerns me for a patient that can acutely worsen and I'd like to be proactive with him.
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Chronic renal insufficiency at Bisley's age will manifest mainly as anorexia, polydipsia (increased thirst), and polyuria (increased volume of urine). It's certainly something I see at his age but doesn't explain his current behavior. I can't rule out his passing a urinary stone, however, but I would expect to see his straining to urinate if that were the case. Please continue our conversation if you wish.
Dogs often sleep as default behavior when they're ill/uncomfortable and in terms of seizure activity, sleep is the most common post-ictal (post-seizure) behavior.
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