I think it depends on the individual dog...I feed raw (and include veggies)....but sometimes I also feed kibble...which does contain brown rice and barley...as a snack, my dog also gets things like boiled potatoes or chicken with rice every now and then...and she does great on it..
But some dogs might not take to grains or veggies that well...again, it all depends on the dog, but I do think its extreme to say that you cannot feed a single veggie or piece of bread to your dog or else....like Mordy says, those types of people are raw feeding zealots and drive me nuts! lol
If you're interested usurp, there is also a great food I use with my dog's raw to make life easier..it can also be used with cooked meat..its called Urban Wolf...I swear by it!
http://www.urbanwolf.com
There's also ready made raw if you have the money as it gets pretty pricey but its already done for you, meat, bones, veggies and all. I use it occassionally but like I said, its making me broke! LOL
http://www.healthy-paws.ca
And just recently, a new food came out called canine cuisine...its a cooked food diet that's already made and frozen - all you do is thaw, warm up (if you like) and feed. Its also very convenient but I'm not sure about the prices as not alot of stores have begun to carry it yet.
http://www.caninecuisine.ca/
And finally, there's nature's variety..they sell frozen raw cubes (fully prepared and balanced) and they also sell dog kibble that has a raw bio coating on it. Its one of the only dog food companies I've seen that agree with food rotation lol...personally, my dog didn't take well to their dry food, she had tummy problems and would vomit regularly, but I gave a whole bag to my friend and her dog absolutely loves it.....
Hopes that helps a bit.