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Hi I'm Dr. Carole and I'm sorry to hear about Libby. From the information you provided I would say she most likely is suffering from Idiopathic Vestibular disease. It is very common in older dogs and it is a condition that affects the balance center in the inner ear or brain. The condition can come on suddenly and usually lasts for 7-10 days then goes away on its own usually without treatment. Sometimes it can make the dog nauseous and then she might not eat but you can give her something called Meclizine which helps with the nausea. Some dogs will develop a head tilt associated with this problem that may not completely go away when they get better.
The only thing that you should have her checked for is a middle or inner ear infection that can also cause this problem and that would need to be treated with ear drops and oral antibiotics and sometimes steroids.
The tumor is unlikely to be causing any problems like this.
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