Help Melinda's Cat Recover from Dog Attack

Hi my name is Melinda and my service cat that I got because my 12 year old son was murdered was in a dog bite accident. A neighbor’s two pit bulls got loose and came in my yard and tore my cat apart he was covered in blood last night. I took him to the ER last night it was over $500 just to get him an IV with fluids and pain meds at the hospital and to come home with.. he needs Xrays and possibly surgery or a leg amputation. I am a single mother of now 3 children and I can’t loose my cat he is my comfort.. please if anyone can help even a little it would help me take him to the vet to get completely fixed and out of pain… I would be so grateful for anything