My german shepherd is 19 months old and pretty thin, weighing 61lbs, and quite tall at 25.6 inches. She eats 6 cups a day of dry kibble. Currently she's on Medi-cal Fiber because she has stomach issues. She used to eat Medi-cal Preventative and I switched her to fiber after she began to constantly pass gass. However, now she is still not gaining weight. So, the vet suggested I switch her back onto preventative to help her gain weight, which I'm in the process of doing. She's started to pass gass again, and after 2 weeks of slowly switching her has still not gained a single pound. I'm a student and struggle with the $100 bags a month as it is and can't imagine having to pay more. Does anyone have any suggestions on how to help her gain some weight? Or a kibble that will keep her stomach settled but also keep her at a healthy weight? Thanks in advance!