Cerf is done once a year on breeding dogs and vWB NE and color tests can be done on puppies but should be done before breeding.. I like to do a prelim on the dogs that I plan to use or show, as at ten months you have a pretty good idea what is what. But his a habit that I formed 20 years ago...Many breeders do Pennhip because they can do it very early and then breed early. I think Pennhip is a fine form of hip evaluation BUT it has to be done later (I like after age 2) because hips change as the dog grows. I think it does no good to hang your hat on a hip evaluation in a 5 month old puppy.
CERF uses a physical exam to check the eyes for PRA. Optigen tests only for a genetic type of blindness known as prcd-PRA. prcd-PRA is found in Minis and Toys, but not in Standards. Minis/Toys should have both Optigen testing and CERF testing. Standards just need CERF testing.
Thyroid is usually run every year.
The SA test is valuable because it still catches a large number of sub-clinical SA cases. This is when a dog has SA at the cellular level but it has not been physically expressed yet. I would want to see that a Standard poodle under age 5 had been tested clear. Usually by age 5-6 the dog will start showing signs of SA (but not always... I know a couple of dogs who didn't present until after age 8)
Don't forget NE and VWB if you are breeding standards and Patellas and Legg-Calve for Mini/Toys