Do dogs really need to eat wet dog food?

I've always given my dog a little wet dog food in the morning and only dry dog food later in the day, measuring the portions correctly so must of her diet is dry dog food and she doesn't get fat. Recently I switched her to a limited grains diet and she's doing great on the dry dog food! She loves it! But wet dog food of the same brand seems to make her sick. It's healthy and a fish based diet, but she puked a few times after eating it. I stopped giving it to her entirely and now she's on a completely healthy dry dog food diet. So should I just keep her entirely on dry dog food or try a different brand of wet dog food again? Do dogs need wet dog food incorporated in their diet? If so, what brands do you recommend? And no more fish? Should I try chicken? Or beef?