When I was house-sitting, I used to look after a client's two boxers, and they could clear a room faster than anything! and they's look enquiringly at each other, as if to say "Was that you?" Lovely dogs, very friendly but excessively flatulent! I suggested to the owner that maybe a change in diet might help.
My godmother used to have a pug, it had to sit on the sofa beside her and it farted a lot. I remember it well, it was the first time as a child that I'd met a farting dog.