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Hello and thank you for using this site to help you. You may be looking at vestibular disease which happens when the inner ear does not communicate to the brain. This usually coincides with an inner ear problem such as a ear infection or ruptured ear drum. Sometimes it is idiopathic , meaning no known cause and this is usually seen in older dogs.
If it is an inner ear problem you want your Vet to check that so the approriate meds can be given. Ear infections would have an underlying cause of Bacterial, fungal or yeast so the proper meds are essential.
Here is more on Vestibular disease http://www.petplace.com/article/dogs/diseases-conditions-of-dogs/brain-spinal-cord-nerves/vestibular-disease-in-dogs
This breed is also prone to hypoglycemia, and heart disease which can show the same symptoms so you want to be sure it it not one of these either.