I know this was back in 2008 but I just adopted a dog 2 months ago and the ringing in his ear's is so loud that you can sometimes hear it from 3 to 4 feet away in a quit room. Like yours, his right ear is louder and he did have a recent ear infection. He is about 2 years old and otherwise seems healthy. The vet and the doggie neurologist (yes, thats a thing) are both stumped.