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Coco could indeed be having seizures
. Not all seizures involve trembling and involuntary movements. Seizures can include involuntary vocalization and urination. Read more on seizures here:
Seizures can be caused by many things including hypoglycemia
(low blood sugar). If this seems to be happening at night, be sure she is fed a small meal before bed to keep her blood sugar levels up overnight.
I also would not rule out stones though usually with kidney issues you do see an increase in drinking and urination.Passing stones can be painful.
a small meal before bedtime stops the behavior
then that should keep the problem from occuring in the future. If she continues to have this problem even with an extra small meal, then have your vet take a look at her. It might still be seizure activity from an alternate cause or a kidney issue.
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