Save sammy

Yesterday 12/27/17 my 8 Y/o choclate lab had his right front paw amputated due to an aggressive cancer Osteosarcoma. Sammy is vibrant, happy and a very important member of our family. It was a difficult decision to opt for surgery but even more difficult not to help at all . He has done well so far 1 day post op but sammy will need costly chemotherapy, and many return visits for follow upcare and testing . I dont like asking for help but i dont know where else to turn. Please help Sammy