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Hello. Thanks for the question.
Trembling/ shaking is a common sign of pain in dogs. Often times it's due to back pain. Back pain from a ruptured disc is a common diagnosis that we make in veterinary medicine. Many of these dogs come in for trembling, panting, inability to get comfortable, reluctance to jump up, reluctance to climb stairs, and yelping. The signs are quite vague.
We can often times get a pain response when we press down on the spine just behind the rib cage. This may cause vocalizing or even just holding their breath or buckling their knees.
The treatment is usually with 1-2 weeks of pain meds (Rimadyl, Gabapentin, Tramadol) and rest/ crate confinement.
I hope this helps, let me know if you have any other questions.