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Thanks for your question regarding your boy Fred who seems to have had a seizure. Typically seizures only last a minute or so and the after effects generally only last half an hour or so max. If it has been 2 hours and he doesn't seem right, then it is possible your boy has been having extended grand mal seizures or is in 'status epilepticus' and is having ongoing small seizures. It could even be that there is something else entirely going on here and that what you saw wasn't actually a seizure. If he is still lethargic, shaking and unwell, then you are best to get him down to your local ER vet now if you can.
If he hasn't improved after this seizure and it has been 2 hours, this is certainly enough of a reason for a vet visit straight away for Fred. Let me know if I can help any further here.
Also in terms of keeping an eye on Fred, if you can do so safely, please check his mucus membranes, capillary refill time and respiratory rate as follows:Mucus membranes - flip his lip and look at the color of his gums. They should maintain a nice salmon pink color. Get him to the emergency Vet if they appear white or very pale pink, or if they are a dark deep red color.Capillary Refill time - this measures blood perfusion and test this by putting your thumb on his gum to apply pressure. After you release your thumb you will see the gum blanch. Capillary refill time is the amount of time it takes (in seconds) for the gum to return to a healthy pink color from the blanched white color. If 2 seconds or less don't worry - if it is taking significantly more time, again - off to the emergency Vet.Respiratory Rate - if he is continuously panting throughout the night, this is a sign of shock and or pain and a signal for a trip to the emergency Vet.
If any of these parameters aren't right or if he still seems to be recovering from the seizure - definitely get him seen now.