Help Boomer beat cancer!

Boomer has been diagnosed with a soft tissue sarcoma in his right hind leg that is growing quite aggressively and needs amputation from a doctor who is confident he can get clear margins. It is a large mass and causing him pain and without amputation we will most likely lose him soon because of the pain it is causing. We would appreciate any help anyone is willing to give. We love him very much. He is a sweet heart! Thank you!