Would be better to train her to ignore other dogs on her walks.
You could use treats to get her to look at you as you walk by, keep doing this and eventually she will be comfortable with ignoring a dog she is walking by.
Using a 'look' or 'watching' command, give the command at the same time wave a really yummy treat in front of her nose and bring the treat up to your eyes - when she looks at your, reward her with the treat. Keep doing this while you are walking by.
if your GSD is eating and eating and eating and losing weight - please consider testing for EPI.
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