Ask your vet to check for worms and be aware of what you are feeding him. Are you feeding him something different to what the breeder was feeding? If so, you may need to switch foods a little slower, phase in your chosen food with breeders slowly to give his tummy time to ajust. Poops may also be looser after exercise.
if your GSD is eating and eating and eating and losing weight - please consider testing for EPI.
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