If your dog is in discomfort, it needs to see the vet. And yes, you'll likely have to spend money on testing. By the way, anytime I've ever done any testing on my dogs for various ailments I've always gotten an answer so it's pretty unlikely your testing will be inconclusive -- either it will rule something in or it will rule something out. The tremor could be any number of things and his best bet is the vet, and the sooner the better. Best wishes.
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