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This is Dr. KV. I'm here to help with Elvis. Trembling and walking stiffly can be signs of pain. Occasionally, the injection from the vaccine can cause some temporary soreness. This usually subsides over a day or two. Encouraging him to walk and get his blood flowing will help with any temporary soreness of the injection site. A vaccine reaction that would be of concern would be facial swelling, vomiting, weakness and/or collapse. It would be wise to call your vet to report his symptoms.