This happened about two months ago:
The best pet I've ever had, a 9 year old yellow lab, had a giant splenic tumor. Dog was barely eating. The vet said I should put him down in the next week. He said I should give him his last meals--something tasty. I'll always remember on the way out there was a new receptionist who cheerfully offered, "Have a nice day!" even though everybody could plainly see I'd been crying my eyes out. (Probably the first time I've cried in a decade or two.) I don't know how I didn't murder her.
Anyway, I get home and grill up a nice steak for him, then chop it up. He eats nearly the whole thing. Next day I do the same. Day after that I switch to a softer dog food, and he goes along for a month, looking healthier and happier. But the tumor was still enormous and getting bigger.
So I go to a different vet. This guy asks me if the other vet had x-rayed him or performed an ultrasound. I said no. He winces, then we go straight to it. After consideration, the vet says, "It'll cost you around $800 or so minimum to operate, depending on how complicated. Given what I've seen, it doesn't look cancerous, but it could be. If it is, he'll die within a few weeks to a month or two. If it isn't, he'll recover fully."
I tell him to proceed. Vet calls me after the procedure is over. He says, "Look, I just pulled out the biggest tumor I've seen in 30 years. I'm not kidding. It was 10 pounds (the dog is only 60 pounds) and the size of a volley ball. I'm having the tumor cremated after I get some pictures." A few hours later he calls back to say the biopsy showed it wasn't cancerous. The dog had 30 staples to sew him back up because the hole they had to cut to get the tumor out was so damned big. The bill was an astounding $2000 because of how ridiculously large it was and difficult to remove. I pay it.
Two weeks ago I took my dog to the coast on our annual family week holiday. Every day he got healthier and healthier, until the last day he was running as fast as I'd seen him when he was 5. I'm planning on taking him bird hunting this fall. Which is great, because besides being the best dog I'll likely ever have, he's also the best hunting dog I've ever seen.
His name is Mook.