Sir's surgery fund

Several weeks ago sir got injured by another dog at the park. He has been unable to put any real weight on his back left foot since. After a follow up visit to the vet they have decided he is going to need a very expensive surgery to repair the ligaments in his leg if he wants to walk on it again.
I got sir from a shelter 4 years ago when i was going through a really bad time in my life and needed a friend. Since day one when I brought him home he has been taking care of me and keeping me from falling back into depressing times. He is the most loyal pet I have ever had and I would do anything to help him get better.
Please help me get Sir this surgery every little bit helps and I would be eternally grateful.