I'm so very sorry to hear that you lost your beloved Sam - losing a pet is absolute hell and the hole left in your heart never quite heals, even though you will have room in your heart to love another animal
I have had two companion Goldies from Verdoro Kennels. Anne Greenbank is an accomplished veterinarian by profession and a stellar dog breeder. She understands bloodlines and uses this understanding of genetics to breed dogs for health and temperment, whch results in wonderful puppies for show, work, and companionship.
My first Goldie, Tally, who was a huge female, which disqualified her from show quality, was diagnosed with Hypothyroid disease at age 2, which was successfully treated until she was 9, when she developed pulmonary edema and passed just after her 10th birthday. Anne supported me in learning to treat this disease, which is not heriditary, and helped become a great pet mom.
My current Goldie, Ruby, is a very small girl, weighing in at a whoopping 48 pounds (soaking wet). She was not show quality because of her small size. She is amazingly healthy, and aside from a ripped out cranial cruciate ligament and ruined meniscus (doggy sport injury), at 10, she has healed amazingly from surgery, she hikes mountains, and is going strong. No signs of lumps, bumps, arthritis, or cancer.
The point is, even the most careful and deliberate breeding can result in a pup that acquires an illness. It happens.
If you haven't contacted Anne through her website already, you might consider doing so. Even though there is nothing that can be done to ease the loss of Sam, I know that Anne appreciates knowing what happens to all of her puppies. The information, even when it is not good, allows her to see if there is any correlation between puppies of a given litter or repeat litters and illnesses so that she may make better breeding decisions in the future.
I sincerely hope you saddness has eased, I hope you have another goldie in your life. Be the person your Sam knew you are