Some GSD are real talkers and barking is perfectly normal form of communication and outlet for them (is just annoying to us humans). Start taking notes of his barks such as the tone, how rapid the barks are, how deep, where were you, what was happening, who was there etc and you should be able to eventually work out whether his barks are based on fear, excitement, guarding, playing, boredom etc.
Also, with other dogs, watch the other dog - what is his reaction, if the other dog is getting excited then your dogs bark is excitement, if the other dog is becoming fearful or aggressive then your dogs bark is aggressive.
if your GSD is eating and eating and eating and losing weight - please consider testing for EPI.
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