Thinking about adding in a wet mix (2 questions)

First question actually (saves me making a new thread)

Pup seems to be farting abit and quite smelly at best of times,hes been on wainwrights 2 weeks this weekend,is this just a phase he mite go threw untill hes fully settled on it or is there just certain foods that can generally make a dog pass wind

Second of all is that ever a reason to have to change food again if it carrys on.

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So was thinking of maybe adding some wet mix to puppys food in the lines of maybe Wainwright's Puppy Trays,first of all if i do this can you simply start giving it to him or do you need to break this in ( but also keeping in mind hes only going to be getting alittle bit to flavour his dry food rather than say 80/20% but more like 95/5% with dry being the main source and 5% being the wet.

Why do you want to add wet to the dry? Is it because he isn't eating, or just because you don't think it looks appetising?

If he isn't eating, why not add some sardines in oil (or tomato sauce) or a raw egg to his food? Much better for him.

If he's eating it, why add anything at all? 

Some dogs can fart for england no matter what food they're on - the least smelly will be raw, though.