 Puppies should eat about three cups of food a day and adults three to five cups, depending on the food and how active the dog is.Cancer is the breed's biggest killer, causing 61.4% of American Golden deaths according to a 1998 health study conducted by the Golden Retriever Club of America.The most common is hemangiosarcoma, followed by lymphosarcoma, mast cell tumour, and osteosarcoma.