Hello I am Dr. Joey. Thanks for trusting me to help you and your pet today. I am a licensed veterinarian with over 15 years of experience. I look forward to working with you.
This does sound concerning for Diesel. My top suspicion based on your description is if he is experiencing shooting pain that could radiate from his back/spine or a joint. Or this could be a muscle spasm. Of if he has heart or blood pressure issues he may have thrown a blood clot which is quite painful. And finally, a focal seizure type event that could affect just one limb is possible.
The difficult part is to decide if this warrants an immediate veterinary visit or if a wait-and-see approach is okay. If he is resting comfortably for now, then I feel you could safely monitor today to see if this recurs. If he has a third (or even fourth) incident today, then this would be an indication the problem is not going to resolve on its own and an exam by his veterinarian today would be in his best interest. If he does great today (and his appetite should return by tonight; no worried on him not being interested right now), then you should start a notebook of unusual incidents like this so you can then review how often this is occurring. This is what we do for our epileptic seizure patients to try to keep track of how often a seizure actually happens (you need to document what happened in the incident, how long it took him to recover to normal, and of course the date/time).
If you elect to monitor, then I recommend he rest today (no long walks or heavy exercise) and do not worry about getting him to eat immediately. Try feeding him as normal later today.
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