Since pre-made raw brands already have a significant amount of veggies in them, I would not give additional veggies, fruit or anything cooked as your dog cannot utilize these thing properly anyhow and it does not provide nutritional value. Too much, or in some dogs very little veggies *could* also result in problems;
http://www.yorkietalk.com/forums/yor...egetables.html
Better options are freeze dried snacks as it also adds much needed protein to the diet. Local Feed Stores often carry these but you could order online. Here's a store that I personally like and their freeze dried treat line-up;
Freeze Dried Dog Treats :: EAT :: Olive: Green Goods for Modern Dogs