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This is Dr. KV. I'm here to help with Minnie today.
Is Minnie eating? Does she seem painful when trying to chew?
Ok, thank you for the additional information. It sounds like Minnie is definitely not feeling well. There are several reasons why her jaw could be trembling: pain, stress, anxiety and weakness to name a few. If Minnie has not recently been to the vet, I recommend taking her in for a complete physical exam and senior blood work.