Thank you everyone for the comments! Roxi is back to normal after a night full of horrible gas. Still pooping like crazy but her belly is considerably smaller. Thanks again!
Seems as though I'm a little late to the party, but glad to hear that everything is well. I had this happens several years ago with a "Little" mastiff/ APBT mix puppy I had. His little belly was so bloated that he couldn't really lay down comfortably or climb the stairs without his belly hitting the stairs and whining... lol. Luckily for me I had a bit of a dog expert family member in town visiting and they calmed me down through it. By the time I got to my puppy all that was sticking out of the food bag was a cute little puppy butt, back legs and furiously wagging tail... lol. He too was fine and I invested in sturdy tupperware bins to store food in after that.