I've had many dogs go through surgeries at various ages in their lives. It always is a little harder on the older dogs though.
I lost a dog, Ernie, to a tumor rupturing his spleen... I had No Idea he was even sick..as he was eating and drinking and acted normally. He was gone within 20 minutes of it happening...bled to death internally.
So, I really do feel for you and your dog....and again, I hope everything turns out ok and also it's good that he gets a chance of waking up and being able to spend more time with you. I've had many many hours of heartbreak wondering if I missed something...and never gave Ernie that chance....but I also know that I pay pretty close attention to my pets and I just never noticed he was ill. So it came as a complete surprise when he died on me.
It's a fairly routine surgery and as long as there are no more tumors in other places it should go well. I have done hundreds of these myself and never had a bad outcome (at least from the surgery… some dogs did have metastatic disease and did succumb later on from the other tumors that spread elsewhere)
The surgery went well, they were able to remove the spleen and entire tumor. He had ruptured and started bleeding into his abdomen, so they got in there just in time. The bad news is there is a chance for it to come back, as others have mentioned. But for now he will enjoy a much more comfortable life. Hopefully for many more years.
He is staying the weekend at the vet, they wanted him on IV antibiotics and pain medication, as well as fluids to offset the blood loss. He only weights about 9 pounds, and they removed a baseball sized tumor. Poor guy!
Being away from him is just as hard, I want to snuggle him and make sure he is comfortable. The people at the vet office must think I am crazy as I must have called at least eight times throughout the day on the day of his surgery. Yesterday I went and spent an hour just sitting with him. Hopefully he comes home tomorrow.
I'm so glad he's made it through the surgery. Hope he's home soon and that you have many more years together. This sort of thing can sure make you appreciate every day with them as a gift. He's absolutely adorable but you know that.