Mine have a varied diet, they get Arden Grange dry food in the mornings and their evening meal is any of the following: tripe, chicken wings, pork ribs, lamb breast, rabbit, Nature Diet, sardines&egg, lamb ribs. They are not fussy dogs though and are equally happy to eat the AG kibble as the tripe etc. If they started turning up their noses at the dry stuff then that's all they'd be getting for a while until they got over it. All the food they get is good quality and I'm pretty harsh in the respect that they eat what's put in front of them or they don't eat! If you want to feed him a wet diet though then it won't do him any harm as long as you choose a good quality brand and keep an eye on his teeth - you could consider giving him chicken wings or similar a couple of times a week which should take care of that.
Good wet food brands are Nature Diet, Nature's Harvest, Nature's Menu and Applaws and Burns, Arden Grange and James Wellbeloved also do wet foods.