My female will hump our cat whenever she gets the opportunity (which is not often as our cat is the boss!). Harry will occasionally hump Lola's head?
It can be a dominance issue or her trying to get your attention. I would gently but firmly remove her from your leg and walk away, don't laugh at her or reinforce the behaviour, you should aim to ignore this behaviour from her and be consistent, give her plenty of attention otherwise but if she starts humping you, walk away.
if your GSD is eating and eating and eating and losing weight - please consider testing for EPI.
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