Our expert says:
Sorry for the late reply.
Head tremors can be from side to side as in your case or up and down. In general there is no explanation for this condition - termed Idiopthic Head Tremor. The tremours are usually more prominent when the dog is less active. In humans the nodding of the head can occur with a lesion in the thalamus.
The is no information on the most appropriate treatment. It is said that there maybe a partial response to antiepileptic drugs. These tremours rarely affect the animals quality of life
Please note tht there can be other causes to this condition - inflammatory or infectious diseases.
If you want to proceed further then you would need to go to the vet and get a full diagnostic work-up that may include blood work, CSF analysis and even imaging of the brain.
I hope this helps
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