Will Falconer, DVM Moderator
While I don't advise a rabies nosode, no, it shouldn't cause physical symptoms. If any remedy is dis-similar to the patient and is given long term, however, you can prompt the animal's underlying chronic disease to start to show physically.
Best bet is to hire a qualified homeopathic vet to guide you. I explain how to choose a good one on my Recommended Resources page.