Some owners prefer only pure bred St Bernard's. All St Bernard's need the same quality home and owner. If you are set on an American Kennel Club registered St Bernard here is the link https://www.akc.org/dog-breeds/st-bernard/
Interested in more information on St Bernards?
Check out this article at your dog advisor titled "The St Bernard – Your Ultimate Breed Information Guide" it is available at https://yourdogadvisor.com/st-bernard/