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Hi this is Dr. Hill. Please give me a moment to type my full response.
Preston likely has neck pain that is lateralized to the left side. This can be due to a few different problems. Typically, it is due to a ruptured intervertebral disk in the neck that is causing compression to the spinal cord on one side. This is more common in certain breeds (beagles, dachshunds, pekingese, corgi). The diagnosis is made based on physical exam and exclusion of other possibilities. You can also see neck pain with joint disease: tick born infections, osteoarthritis, bacterial infections, neoplasia. It is not classic for these other issues to affect only one side of the neck. I would also make sure that there is no evidence of an ear infection or any type of bruising/wound on the left side. Please ask any additional questions.