Harry (3yo) and Lola (5yo) both dream, when they are in a deep sleep their front and back paws move like they are running and Harry whines and yelps - it is just a dream for them.
The thing I thought of when I read your post, was maybe she was laying on her left leg and when she woke up, the leg was 'asleep' and she couldn't move it, as pups they are very vocal when they get hurt.
If it keeps happening and other issues crop up then discuss with your vet.
if your GSD is eating and eating and eating and losing weight - please consider testing for EPI.
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