Surgery for Knox

My life has been flipped upside down. A few weeks ago I took Knox in to test a lump I found on the back of his leg. I found out last Tuesday it was cancer. 
Today we went to Montreal for his oncology appointment, and his doctor is confident he can remove the mast. It is currently sitting ontop of his lymph node, which he will also remove during surgery. Today, the doctor took a piece of his spleen and liver to test to make sure the cancer hasn’t spread. 
My tail is between my legs. I cant believe I am even doing this, asking for help. 
Thank you for everything and anything