
The breeder of the puppy should show you the health certificate checks. If she didn't you could still ask, she might just have thought your friend would not be interested.
If she didn't get any health checks done, was she aware this must be done? Some pet owners want to have a litter from their dog, if their vet or the stud dog owner do not advise them to get health tests done then they often don't do it. There is a world of difference between the person breeding from their pet to somebody breeding from a bitch for the money to be gained.
It might not be a case of a "back yard breeder" but of a pet owner breeding a litter to keep a puppy from.
If any of the grandparents or parents are tested under the BVA schemes their results are recorded at the Kennel club anyway.