This was the same vet that said Ender was fat... hahahaha. (not our normal vet) She also gave Eric the "ear infection" speech before even looking in Ender's ears and then was surprised that his were clear. Maybe she just expects all labs to have yeasty ears and too much fat... I dunno.
Our normal vet said, "Oh we have several clients doing that... as long as it works for Ender that's great... seems like it has really cleared up his issues"
Ok! Has he ever seen a wolf grazing in a wheat or corn field?!
Actually, coyotes do eat corn, and I have seen a wild canid eating in a corn field. Not a year goes by that we don't hunt coyotes out of our and our neighbor's corn fields. I don't equate that to being a need, and I don't think any evidence exists that grains are a requirement, but they do eat them...even in the wild.
They're not obligate carnivores which is why their teeth aren't the same as many carnivores. They can, and do, eat non-meat items in the wild - however, they're closer to a carnivore than an omnivore (like us). That's why you can find sources that support either view (omnivore or carnivore) because they do have characteristics of both.