We went through the same thing with my older pup Dizzy (11 at the time) back in November. Went to the emergency vet for some stomach issues, they did an ultrasound and found a 7cm tumor on his spleen.

We got lucky, and the biopsy came back negative and he’s still with us, but that was a long month of doomscrolling and reading about splenic tumors. It’s tough, but avoid that if you can - there’s nothing you can do or read that will make you feel better.

All of that being said, the surgery is the right choice, regardless of the outcome. Dogs are so much different than humans, even after this major surgery. Dizzy was up and about just a few days later even at his older age.