Vet's advice sounds like crap to me. Obviously a raw food diet should be carefully balanced but a dog in the wild will be eating meat from the moment they're on solids, no question.
I fed my dogs pretty much exclusively on Science diet (don't get me started!) for the first year I had them and now they're thriving on raw food. And it might be coincidence, but Pedro's 'eye snot' has all but disappeared - he used to have constant goo in the corners of his eyes and 2 lots of antibiotic ointment didn't do a thing to clear it up