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Diagnosis, prevention, and management of canine hip dysplasia: a review
Canine hip dysplasia (CHD) is a polygenic and multifactorial developmental disorder characterized by coxofemoral (hip) joint laxity, degeneration, and osteoarthritis (OA). Current diagnostic techniques are largely subjective measures of joint conformation ...
Has some info. And it's hard to say. Some dogs can have really bad hips but be active, others mild and be in extreme pain..Be t the 30 minute walks are not a huge shock to me.