Grayhound- I think its your food. I mean, some foods just dont work well with all dogs. I think you said you were feeding nutro. Try bil jac, or solid gold, or royal canin, uhhhhhh.. The bil jac turns to mush really quick. I wouldnt think it would make gas in the stomach. Just get a little bag. Just try it. If she hs a problem with Bil Jac, it could be because of a sensitivity to chicken. The next one you try, try turkey and rice, or lamb and rice..
Keep us posted. I am concerned about kibbles that swell in a deep chested dog. After all these years of having breeds with a deep chest, that is sort of a knee jerk reaction with me as I am sure you can understand.