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Hello, I'm Dr Gary. I've been practicing veterinary medicine since 2007. I look forward to helping with your questions/ concerns.
The signs you were seeing after the seizure- visual impairments, incoordination, panting, restlessness- these are all normal during the post-ictal (after seizure) period. This post-ictal period can last anywhere from a few minutes to a few hours.
The cause of the seizure could be one of many things- epilepsy, brain tumor, meningitis, encephalitis. The only way to know for sure is to get an MRI of the brain and CSF (spinal fluid) tap. This can be done with a neurologist if desired.
Many people elect to just treat without getting a diagnosis. That would be with an anti-seizure med, Phenobarbital. I usually wait until dogs are having > 1 seizure per month before starting Phenobarbital.
Here's a nice handout on seizures in dogs:
I hope this helps, let me know if you have any other questions.