Areas like grated open drains and stairs that have no backs can be a challenge. I haven't experienced walking over grated open drains but do have 5 steps outside that don't have backs, all mine when young were very cautious and would avoid it. I just kept going up and down plus seeing another dog going up and down helped them to learn it was ok.
I would preserve and if you have the time, spend 5 minutes everyday training her to walk over the grates by using a high value reward item (usually really yummy food like roast chicken), lure her over it with the food. If you can put in the time and have patience, she will eventually learn.
if your GSD is eating and eating and eating and losing weight - please consider testing for EPI.
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