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Well crap, id seek a second opinion personally.

Are you positive that he isnt getting into anything in your yard? Is anyone giving him treats, etc?

Also ask your vet about possibly giving him a low dose of Pepcid AC. My corgi occasionally...

That sucks, hopefully its just something simple causing the vomiting

First, if the vomitting continues at all on the Wellness, you definately need to get a full work up done by your vet to determine the cause. Vomitting on its own is generally not a sign of an allergy...