Yeah pretty much depends on the dogs genitics,, and the dog in general.

Kirby almost died on me a few years back. he had the dog version of AIDS. not sure how got it.. whether he ate something to make his emmue system to go haywire or what.. but its when their body stops making enough red blood cells. and the become very very weak. and his gums were pasty white.

and he was put on storid pills to boost his emmue system. and was on them for quite a while. at least 2 or 3 months. and we had to slowy take him back off them. and there was no gurantee that the pills would correct the problem. there was a 50/50 % chance that he could revert back stage one.. and be on steroids for the rest of his life.. or come through all the way and not have to be on any medications

but i also think he helped to heal himself by having a strong will to live.
he was so very close to dieing.. all he had to do was give up