Well, I changed from Hill's Science on the advice of several people here, apparently it's not that great. But the gas is just a Boxer thing, regardless of the food!
My pair are completely toxic! Once or twice I've actually gone to check if one of them pooed on the floor, it's been so bad! Tink has a knack for aiming them right at your face too! I swear she does it on purpose...
Having said that, I also think that a certain boyfriend has tried to pass one or two of his off as theirs! 8O