There is a food sold by walmart that is called old roy, we call it old farts. I had a farty lab that my roommate made him take a tablespoon of mylanta every night. That worked, I didn't think to see if it was safe because i was young and dumb, yet he lived to an old age so i guess it didn't hurt him any. Is there a gas x for dogs? Do charcoal biscuits for dogs make a difference? Our feed store sells them as treats. They are good for sour stomachs, that much I know is true.