Blue leads an active lifestyle: she runs four times a week around an enormous park in her hometown of Memphis, Tenn.; she likes playing Frisbee and loves swimming. But one day last November, Blue started limping which was odd because the German shepherd seemed fit and was only 3 1/2 years old. "She wasn't recovering as quickly as normal from a trek in the park. I thought that was just a sign of aging," says her owner Twila Waters, 43, with a wry chuckle.
In fact, Blue had hip dysplasia, a fairly common and sometimes crippling...
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