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Muscle spasms in the neck area are often set off by a bulging or ruptured intervertebral disk. Many dogs are very good at hiding pain so she may be more uncomfortable than she is letting on. If it is a disk problem, the signs can progress over time and can worsen to the point of loss of function of limbs. I would definitely advise that you have her evaluated by your veterinarian so that a thorough physical exam can be performed and a full neurologic evaluation. If a spinal disc is involved, the neuro exam can help to localize it and determine how severe it is.
Here is a link with more information about disc disease in dogs, and how it is diagnosed and treated.
I hope this is helpful. Please let me know if you have ANY other questions. My goal is to give you 100% satisfaction and if you are not yet satisfied, please reply so I can clarify for you.
My posted replies are for general education only and not meant as a diagnosis. Only after a thorough veterinary examination can a diagnosis for your pet be made and specific treatments be advised or medications be prescribed.