Hi,
I'm sorry to hear that your JRT is having this issue. There are several things that may be causing his symptoms. A few of the main concerns are:
Ingestion of something toxic (plant, pesticide etc.)
Infection
Parasites
General Pain (stomach issue, back problem etc., can all cause shivering)
I would suggest that you call your vet as they know his medical history. If it's supsected that he may have gotten into something he shouldn't have, he'll need to be seen as soon as possible. You can put some Nutri-Cal or syrup on his gums to help with blood sugar, but he will still need to be seen. I hope he's doing better soon and if you have any other questions, let me know. -Robyn
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Obedience, breeding, showing
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