I would love to know too. That is the one thing that just KILLS me! That awful fishy stink, especially when their mouth is in great condition. Well, I guess it's not as bad as when they've been eating poop at least.
I will say though, that both boys have a bad odor to their breath, but End not as much, and she is fed half Raw compared to the boys, who are half home-made half kibble, and mostly kibble. I do wonder many times a day, if it isn't something about the kibble?