If you have to walk him on lead, watch closely as he will tell you he has had enough, once he sits or wants to lay down then it is time to stop. Then you will have to decide whether you want to carry him back home, rest for a while then see if he is able to walk home or phone your other half to collect you with the car! Been there done that.
if your GSD is eating and eating and eating and losing weight - please consider testing for EPI.
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