Did you happen to get a new bag of dog food at the time that this started? There are reported problems with Canidae due to a formula change.
Other than that, you can try cutting out treats and possibly changing food very slowly. If that doesn't work, it may be a good idea to do blood work.
My dog used to throw up every couple weeks until I changed her food. I'm not saying that's teh problem here but it is definitely not normal.
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