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Hi this is Dr. Hill. It sounds like Odie may have had a short seizure. The other possibility is a short syncopal episode. Syncope can occur when there is not enough oxygen going to the brain and typically occurs with a heart arrhythmia that is not allowing blood to be pumped effectively. It is a little odd that the episode only lasted a few seconds, but still within the realm of reason. Has he been diagnosed with a heart problem or had any other abnormal behavior over the last several months?
Okay. So it is more likely that he had a heart arrhythmia that did not pump blood effectively and he passed out (syncope) and his head went back (which is typical for syncope). I asked about behavior changes because we can see seizures in older dogs associated with brain tumors, but we usually will also see behavior changes as well. I would get him into your local veterinarian as soon as tomorrow and get an EKG and talk to them about possibly getting a 24 hour heart monitor to see if he is having arrhythmias. There are other really good medications that he could be started on to help. Please ask any follow up questions. You can continue posting on this thread for a few days, even after rating my response. Take care.
Your welcome. I know how important he is to you. take care.