Oskars veterinary treatment

This is my boy Oskar he is a 6 year old Akita. 
He desperately needs treatment for a spinal injury he has sustained. We have been told it could be anything up to $6000 for surgery. If we could receive any donations it would be greatly appreciated as we have had to put all the costs on our credit card and now it is completely maxed out. We have been told if we don’t continue the most humane thing is to just euthanise him
thank you