Since it is thought to be of genetic origin it is often recommended that dogs with subaortic stenosis not be bred to avoid passing the disease along to future generations. (www2.vet.cornell.edu)
Therefore, dogs with moderate or severe subaortic stenosis, may require medication. (www2.vet.cornell.edu)
Matings that have produced puppies with Subaortic Stenosis should not be repeated. (2ndchance.info)