My best friend Charlie needs your help please.

It's really hard for me to do this and I'm not really sure how its going to turn out but I'm willing to do anything for Charlie. He is my best friend. I have been with him every day for the last 12 years. But here recently he has a growth appeared on his leg which has just gotten worse and after taking him to the vet. We found out the only options are either to lose him.... Or to have an operation to remove the tumor/growth and if I can raise the funds before it is too late, he will not have to lose his leg. Otherwise it's a bleak outlook. The surgery is going to cost between $2000 and $3500. So please if you know me you know how much i love my boy we really would appreciate the help. Thank you all.