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Did he look like he was turning to reach his hind end? Or was he spinning more aimlessly?
OK. It's difficult to tell from the description if he has a physical issue (such as impacted anal glands) or if this could be a neurologic issue such as a seizure.
I recommend having him evaluated by your local vet tomorrow. I would start with a physical exam, checking his anal glands, and some blood work to rule out any underlying organ dysfunction.
Kidney stones (renoliths) are extremely uncommon in dogs, and generally they do not show any symptoms unlike humans.