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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.
It sounds like that may have been a partial seizure. With a full grand mal seizure, we usually see full body tremors and urination/ defecation. We also see a post-ictal period after the seizure where they are uncoordinated and wobbly and sometimes partially blind. This can last for minutes to hours.
When a dog has one seizure, we don't worry too much. Just keep a log on what it looked like and how long it lasted. If it's epilepsy, the most common cause of seizures in dogs, then it may continue and eventually get to the point where meds are needed. This is when they are happening at least once every 1-2 months. At that point we use Phenobarbital to manage it.
Here is some nice info on seizures in dogs:
I hope this helps, let me know if you have any other questions.