[anonymously]

Have you tried soaking the kibble in water overnight in the fridg?

You may find some helpful information here: http://skeptvet.com/Blog/category/nutrition/
And here: http://skeptvet.com/Blog/category/herbs-and-supplements/

Did the vet do a chest x-ray? When my dog had symptoms similar to what you describe, it turns out she had tumors (mets to the lungs).
Golden Retrievers are #1 on the list for developing cancer..