I think the percentage of dogs who die from cancer is more than we realize. Unless they get sick when they're younger, we just assume a dog gets to a certain age and it will die. Do we really know what an old dog died from?
As the internist told us, the reason we don't have a radiation in our area is because they need a CT scanner. The reason we don't have a CT scanner, is they have to prove to the State there's a significant amount of case for it to be used.
What animal healthcare comes down to is the almighty dollar. Unless people have the resources, and are willing, to spend money on testing of their animal, how else can they prove it?