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I have a dog walking around shaking her head from side to side , was wondering what to treat it with . Thanks for any info 
About 1/2 cc of ivomec in the ear for a day or two will usually cure it and also Bloodsworth's makes a ear mite remedy and several others do too, you can find them in Tractors Supply, by the way, if you keep Purple Python cattle tags on your dogs collars this will prevent them from ever happening again. I fought them for years until I started using the cattle tags and this has eliminated my ear mite problem and certainly tick problem too. The tags won't help after they get them but will prevent them from getting on them in the first place.
If its a yeast infection it will have a smell and you will see mucus down in the ear. Kayla, you are correct, mites and yeast infection both cause head shaking but again, the yeast infection will show definate signs of smell and mucus in the ear.