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Originally Posted by Wylie's Mom  Makes me wonder if he has luxating patella - I'd have a vet check his knee caps. His patellas might luxate while he sleeps... |
I agree. What you describe sure sounds like a luxating patella. It is either popping in and out while he sleeps or possibly the joint is starting to degenerate (arthritis) already.
Here is some information on luxating patellas:
Luxating Patella: A Knee Problem in Dogs