just an interesting link from the OFA.
OFA: Legg-Calve-Perthes Information
hopefully this can be of help to the OP.
I don't know anything about Breny as a breeder or the breeder contract but i'm confused a bit- if the parents of the OP's pup had been tested- then how come Breny is still waiting for the results to come back? shouldn't the results have come back before breeding the pair? I just hope for the OP that this can be resolved- it must be heartbreaking to have a sick pup.
Please keep us posted on how your pup is doing.