Spleen and mass removal for little Buddy

Hi Everyone! I’m so sad with the latest news about my little buddy, a miniature schnauzer full of life! He have a spleen mass
and some others in his liver, a little murmur
and finally a growth on his right leg that is growing super fast.  My little angel was recently seen by two vets and several exams/test were performed and the discomfort and pain he is experiencing is due to his several health problems. I’m devastated with the news but there is a light at the end of the tunnel... a surgery so needed that will cost over $4800 that I can’t afford at this time.  I already paid over $4000 in medical bills for him this year and this is just unreachable for me. That is why I’m asking for help,  so it doesn’t matter if is small...every dollar counts. If you have a pet, you know how difficult this is. I took Buddy to Angell ASPCA for a second opinion and their estimates are incredible high but they have the surgeons and specialists to perform the surgery. 
if you can help him, we will gladly appreciate it ❤️❤️❤️❤️