We give Rory a mixture of frozen (& microwaved) vegies every night in her dinner, along with kibble and usually some fresh meat and often rice and pasta.
She has peas, corn, carrots, beans, sweet potato & broccoli.
We don't blend them though. Is it necessary? We started adding the veggies when she needed to lose some weight, as a filler for the portion we removed from her dinner. We can blend them, I'd just never really thought of it.