Yep, the yelp would of been from the cats claw.
I think putting your dog in a crate for the time when your cat is awake and wanting to explore is a good idea and may help the situation. When cats are unsure, their movements are very slow and slick almost like a predator preying on a victim or stalking, maybe your dog took the offensive position.
I'm sure with time and adjustments, they will settle in together, hopefully they will bond again.
if your GSD is eating and eating and eating and losing weight - please consider testing for EPI.
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