There may be a nice(r) way to approach this:
"oh, he does smell doesn't he? We could never agree to get a dog as we always end up accusing one another of farting after you leave!"
"it's true, some breeds are prone to being a bit gassy. I would try another dog food and see if that helps, and we could all smell our coffee next time!" e.g. Royal Canin Bulldog is reco'd for gassy bulldogs for example, lots of info online.
What do you think