"OFA used to give their certification at one year of age. They switched to two years for final OFA certification because they found that 5% of the dogs tested changed from one year to two. That means that 95% of the dogs tested did NOT change from one year to two." I find this statement by Old Timer very interesting. When did OFA change to 2 years and why 2 years and not 18 months?

He'll be x-rayed tomorrow. He has several shows and companion competitions in the next few weeks. We'll see how all of this pans out.

I'm still thinking, thanks to all for all of the replies!!