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I am so sorry this is happening to your boy, I too am owned by a shih-tzu so I can imagine how heartbreaking this is.
Can you tell me how many times this has happened?
How long are they lasting?
When was his last blood work?
Any other odd behaviors or change in eating or drinking
They really are the best, XXXXX XXXXX 4 dogs but he by far is the one who owns my heart.
This really does sound like seizure activity.
When senior dogs develop seizures they are most commonly caused by a problem with the liver, kidneys, diabetes or changes in the brain.While these are the most common causes often no actual cause can be found and all we can do is try to manage them.
It depends on the individual vet as to whether blood work is included in the senior exam. They should have also done blood work before his tooth extraction as the kidneys and liver are the organs responsible for filtering the anesthesia.
If he has had around 6 episodes a week apart this would be fairly close to the time of his tooth extraction so I would ask if blood work was done then.
Once a pet begins having seizures and they have more then 2 in a 3 month period anti seizure medication is often warranted.
Here is more information on seizures
I would suggest calling your vet and having him seen as soon as possible. It is very important to try to prevent any additional seizures as these can lead to permanent damage to the brain, dangerous elevations in body temperature and can eventually lead to a seizure that he is unable to come out of. Your vet will do blood work to see if any of the above problems are the cause and may recommend medication such as phenobarbital to control the seizures.
I really hope your boy is ok, please let me know what the vet says if you have him seen.
Please reply back if you have additional questions or concern.