When we are walking for exercise I do both. If I'm on my own, I am walking two GSDs together but they will both heel together on command and free walk on command.
It is healthy for them to smell things along the way (gets their brain working).
I don't allow them to stop though when they like, however if they are really showing interest in an area I will let them have a good sniff.
if your GSD is eating and eating and eating and losing weight - please consider testing for EPI.
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