Fruits and Veggies don't have much of a benefit to dogs unless they are pureed. Dogs cannot digest cellulose. The cell walls of plants fruits/veggies are made of cellulose, thus we've got break the cell walls so they can get the nutrients out.

Some good veggies/fruits to puree..

Carrots
Tomatoes
Broccoli
Cauiliflower
apples
cantaloupe