The FAQ for the OFA is here
You can do prelims on puppies over 4 months, but can't get OFA'd until 2 years old. It's $30-$40 to send your X-rays in to OFA. I just used my breeder's vet to do the X-rays, since that is who she always uses.
DIANE in Okla.
CARLY ~ AKC Ch. Lauremi's No Reservations (AKC GCh pointed, HIC)
RUSSELL ~ Lauremi's Paix
and absent friends... SAGE ~ Lauremi's Whim Z v Jakmar (AKC Ch. pointed-13 pts, HIC) 2010-2015