http://www.dogfoodadvisor.com/canine...res-omnivores/
quick google search pulled that up.
The key though, if you actually end up reading it, is that dogs have evolved to SURVIVE on a diet including other things besides meat. Not live, not thrive, not do well but survive. You could feed a dog table scraps it's whole life, and it would get a couple years worth of life. Not a good life, mind you, but it would survive.
They're carnivores by the way.