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If she is eating and drinking and not vomiting or having diarrhea, those are good signs. However, the trembling and restlessness could be signs of pain or even seizure activity. Shaking or trembling in toy breeds at a young age could be due to hypoglycemia, liver shunt, or a neurologic response such as a seizure. Trembling can also be a sign of pain, stress and cold.
Hypoglycemia is low blood sugar and frequently causing trembling in small breeds. Feeding your dog smaller meals more frequently can help. If you suspect your dog is having low blood sugar you can put a drop of pancake syrup on your dog's tongue which should raise the level.
A liver shunt is usually a genetic condition. It is a condition where instead of the blood going through the liver and being cleansed, part of the blood is diverted around the liver resulting in a toxic buildup in the blood. You can read about these here: http://www.malteseonly.com/shunt2.html
Seizures can manifest as trembling and a dog may not lose conscienceness. You can read more about seizures here: http://www.marvistavet.com/html/body_seizure_disorder.html
If she recently had a new treat or a change of food, perhaps she is having an allergic reaction leading to the scratching and other symptoms. If you think this is the cause you may try benadryl at a dosage of 1-2mg per pound every 8 hours. If she is not having trouble breathing, you shoujld be able to wait until morning, but if she is having problems breathing, I'd have her seen as soon as possible. Read more on allergies here:
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