Hudson's surgery

My name is Jenn and I'm fundraising for my dog Hudson. He's going to be 13 this year but Jack Russels can live to be 20 we were hoping to get him there. He wasn't eating yesterday so I took him to the vet. I was told he's healthy otherwise, organ function and bloodwork were all good,besides arthritis but the problem is he has a 5cm tumor on his spleen and the vet quoted $2500 to remove it. Otherwise it'll rupture eventually and he'll pass away. He's a great little guy and we love him. We want him around a little longer. Any little bit helps. Thank you for your time.