Here is a link to donate towards research into the causes of hemangiosarcoma. AKC is matching donations to prevent hemangiosarcoma. As a breeder and golden owner, I have personally experienced the devastation of a diagnosis of cancer in one of my former goldens. As I personally interview prospective owners of puppies, I have heard so many tell of the loss of their golden lovebug to hemangiosarcoma. Here is a chance to give to the research process!
http://www.goldenretrieverfoundation.org/chf.html