Are you still there? You left the chat for some reason - maybe you got disconnected? Do you think your wee boy may have gotten into something at home today? What have his signs been since 2pm? Has there been any vomitting of diarrhoea? Has he had anything to eat or drink since this time? Is he up and about or lying around?
Ok - I am sure you will tell me more in a bit. However, if your dog is quite flat (as it sounds like he is), there is something definitely going on. I would definitely recommend you take him to the emergency Veterinary clinic - if for nothing else, to give you some peace of mind tonight. It is always much better to be safe than sorry in these situations as anything could have really happend to your little guy - a toxicity, trauma you weren't aware of, he may even have swallowed something he shouldn't have that is now acting as a partial or complete obstruction within his gut! A full physical examination will help rule in or rule out any number of these problems and help set your mind at ease, rather than worrying the whole night through until you get through till the mornign to take him to your regular Vet.
Please feel free to send through more details or questions if you have them.
Dr M D Edwards