Hello, I'm Dr. Deb.
I recently came online and see that your question about your dog hasn't been answered. I'm so sorry that you've had to wait for a response, but if you still need assistance, I'd like to help if I can.
There could be several possible explanations for your dog's behavior
which might include toxicities of some sort but if the episodes only last for a short period of time (10 minutes as you indicated), then it sounds like he may be having seizures
If he recovers from one and then goes right back into another one OR if he continues to behave abnormally, then this would be considered an ER type of situation.
Hopefully, he's recovered from the last one such that this isn't a concern. What you'll want to do is continue to monitor him closely and have him seen as soon as your vet's office opens tomorrow.
As to the underlying cause, more often than not seizures in a dog this age are going to be Idiopathic...meaning we can't find a reason for them. As a result, we are not able to prevent them. Diet has been implicated in causing these events for certain dogs although a change of diet rarely prevents them from occurring in the majority of them. But something to consider.
Other possible causes (and this is just a partial list) include:
Ingestion of toxins or poisons (but as I mentioned above, the episodes usually last longer than a few minutes).
(low blood sugar)
Topical flea/tick products (for some dogs)
Underlying cardiac issues resulting in hypertension.
I usually recommend that blood work be done to rule out the metabolic causes of seizure activity but explain to owners that additional testing such as an MRI or spinal tap might be needed to pursue other causes.
I hope this helps although again, my profuse apologies for the delayed reply. Deb