Years ago found same in my 6 year old bitch. Biopsy came back stage 3 and vet did surgery. He said "it went all the way to the stomach wall and I don't think I got it all." I was encouraged to do chemo. What I did was spay her ( because I felt that any more hormone activity might activate the cancer) and not do chemo. She lived quite happily and normally until she was 13 years old. Stay positive.
