Unfortunately, LP is one of those nasty things that plague this beautiful breed of ours. Usually, a lot of pups have it and you would never know it. Mine has it, grade 3/4 in both rear knees. If you saw him, you'd never know. Except for the fact that he can't sit like a normal dog. His knees just don't work properly and he can't tuck his legs in. He's never yelped, favored a leg, or anything like that. I also don't let him jump on high furniture or allow his weight to go up. Weight gain is a way to aggravate his LP.
Anyway, your baby has shown signs of pain. He may not be limping and favoring a leg, but he is showing definite signs of pain. Being hunched over, and tense are not good signs. You need to speak to an orthopedic vet. They might give you more information.
__________________ Littlest JakJak 
We miss you Kaji 
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