J.W.
In general the percentages are what this type of cancer does with treatment. Without treatment the odd are greater it will spread. This is not always but when a doctor is describing a course of treatment that includes chemo that means it is taken into consideration in the diagnosis.
So what you may want to ask is what are the chances without chemo.
Regardless alternative medicine for animals? I wouldn't go there. Do you know Steve Jobs would probably be alive today if he hadn't tried alternative medicine. Yeah, he died of a very curable cancer at the stage in which it was caught. Pretty stupid if you ask me.