Are his poops normal looking?
If his poops are runny, yellowish and impossible to pick up then along with the stinky gas, he may have SID small intestinal dysbiosis and will benefit from a course of Tylosin (Tylan) or Metronidazole antibiotic, depending on the bacteria in his gut. Otherwise a pre-probiotic may help his gut. Definitely something to discuss with your Vet.
if your GSD is eating and eating and eating and losing weight - please consider testing for EPI.
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