5% of cats autopsied and 2% of cancers in this species. It most commonly occurs in
the spleen, and certain breeds (such as German Shepherds
, Labrador Retrievers, and Golden Retriever) are at greater risk than others.[73,74,76] Hemangiosarcoma can also develop in the heart, with a reported incidence of 0.19%.
Spayed females have been reported to have 2 times the risk of splenic hemangiosarcoma and 5 times the risk of cardiac hemangiosarcoma of intact females.