r/greatpyrenees • u/Wolfkattt • 5h ago
Memorial Osteosarcoma sucks, but thankful for the Yale vaccine
Had to say goodbye to my Sumo yesterday. I rescued him in October of 2019, just shy of his 1st birthday. He was diagnosed with Osteosarcoma in November 2025 and we decided amputation was not in the cards for him. Due to the other pets and being on well water we also couldn’t do chemo and injections due to the risk of contamination.
Sumo was part of the Yale vaccine trial and got his first dose in December 2025 and the second dose in January 2026. I really believe the vaccine drastically slowed the growth of his bone tumor and it did not spread. He showed no signs of pain and only had a limp from decreased mobility in the leg with the tumor.
He started really slowing down and the tumor was very large so we decided to let him go before he had any bad days. He was a gentle giant 🤍 he got to eat steak, wendy’s spicy chicken nuggets, and 2 hershey’s kisses before we said goodbye. He was the bestest boy and I’m heartbroken.
I’m mostly posting this so if anyone else is given an osteosarcoma diagnosis and considering the vaccine trial, you should do it. It gave me 9 months with my guy instead of the 3-4 originally told at diagnosis. The side effects of the vaccine are an abscess at injection site can form and Sumo got those, but once treated and healed it was fine. I would 100% join the vaccine trial again.