Mild dysplasia should not be showing clinical signs in such a young pup. My 6.5 yr old boy has mild dysplasia and is rarely clinical even at his age. It sounds like your pup has fairly severe dysplasia.
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Berlin vom Spartanville 1/13/13
2008 - 7/23/12
"Take this trouble from me: Make sure my shepherd dog remains a working dog, for I have struggled all my life long for that aim." Max Von Stephanitz