I showed dogs (pointers) for some years with some slight success. Never heard of a breeder offering a written guarantee that dogs were free of [whatever]. Some breeds it is customary to have hip scores, or to ask for confirmation that sire and dam have not had entropion, etc.

Condoms are not guaranteed. But they do substantially reduce all the stated health risks and the risk of pregnancy.

And these were not the thrust of B+B's dilemma, which was about the moral obligation to wait (or otherwise).