Nah. Dogs are carnivores. Just look at their teeth. Compare to a cow's.
Having said that, they are also opportunistic and will scavenge when given the chance. I don't believe they need veggies or fruits at all. However, I will occasionally give Brody cooked veggies off our plates or a bite of a piece of fruit. It's not a big part of his diet though. Way less than 10% of his total intake. More of a snack. If you decide to do veggies, remember that whole veggies will just pass on through and nutrients won't be absorbed. To be processed, you must break down the cellulose wall. So if you feed veggies at all, make sure they are smashed up, blended, pulverized.
Here's a well written article on the carnivore vs omnivore debate, complete with skull pictures and detailed info on the anatomy of dogs and how they digest and process food. Very interesting.