Hi my 10 year old rat terrier stomach started to get big I assumed that I was feeding him to much, it just kept getting bigger I ended up taking him to the vet and the vet did an x ray. The mass she showed me on the x ray is pretty big. She said she would do exploratory surgery to see if I can be removed, but if not she just wants to put him to sleep. What are the complications and reasons she would not be able to remove mass?? My dog acts like he is fine he plays runs swims barks eats normal nothing about him seems sick except the giant mass in his stomach!!