I'm not sure what breed you're familiar with, Zhucca, but OFA allows dogs to be patella tested at 1 year of age and CERF at any age (our opthamologist recommends every 2 years). Of course PRA (cord 1) is genetic and detectable at any age, but it's easiest to swab after 3 weeks since there's more saliva.
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I would recommend that you change CERF doc's. The rep. breeders that I know, some of them do a baseline CERF at 7 1/2 wks. However, ALL breeding stock is CERF'd at least once a year and some of them CERF every six months.
As a breeder, my non breeding dogs get CERF every couple of years as they are related to my breeding dogs (of course that is only my dogs that are over 7 yrs of age too, younger their done s/n or not more often). I don't breed very often, one litter about every 2-3 years (not per bitch either but 1 litter period, I breed for myself first and not to fill puppy orders). However I prefer that the bitch/dog that is being bred is CERF'd within 6 months of the breeding.
I have met alot of CERF docs over the years and NONE of them have ever recommend testing every 2 yrs unless it is non breeding...................