It can happen so fast. Geordi's father was a robust, healthy, silly 7 yr old boy. I got a text at 6:20 am Monday morning - his breeder got home from work (night shift as an ER nurse) to find him dead in his crate. She took him to U of FL for necropsy. Hemangiosarcoma, he had a tumor on his heart that burst. A shock to us all.
Your family is close in my heart Mark.
Same happened with my 7 yr. old, Zoey. Had just been to the vet. Good check up, as she wasn't feeling right. Blood work good. Had a few good days, got to see most everyone she loved (by chance), went downhill a few days later, was almost gone by the time we got her to the vet ER. Hemangiosarcoma on her spleen burst. That baby WALKED into the vet's. Died a few minutes later. They are our family. I lost my one in the Avi to brain tumor (they think) as she had multiple gran mal seizures they couldn't stop. She was the love of my life. Gone 2 years on Dec. 27th and I still miss her and weep for her.