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I am sorry to hear you are worried about Candi. My name is Rebecca. I am a veterinarian and will do my best to help.
If you check her gums, are they pink in color, or do they seem pale?
Beagles can be prone to suddenly getting back pain, or neck pain, with no known injury or cause. When this happens, they do what you describe: stop eating, shake, and often are unwilling to move about.
Shaking is a sign of pain, or fever, or fear (are there any fireworks there tonight for New Years?). Can you take her temperature?
How is Candi doing?
Thank you for the update. Let me know if I can help with or answer anything else.