Being an owner of two German Shepherds I have experienced this a few times. While it’s not good for any of us or our pets to have gas, we all experience it. However, the expressions on your dogs face when they pass gas is priceless!
This cutie clearly is being fed something that doesn’t agree with him but his owner captured one of his frequent fart fests. Enjoy (and be grateful you weren’t in the room)! ~grace