One possibility is a yeast infection but ear problems are tough to diagnose without actually seeing them. Yeast problems in dogs are like those in humans, more often the result of changes in immune response or body chemistry than a foreign bacteria or virus the dog "catches" from somewhere else. The ear also should be examined in case there's a foreign body or growth that might be setting your dog up for the infection.
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If you have a medical emergency, call your doctor or 911 immediately.