They DO get cancer like humans do. That a particular form of cancer is spread by a virus (created by God) doesn’t obviate the FACT that...
a) they are wild animals
b) they get cancer
Thus the inescapable conclusion: Wild animals do get cancer.
So is it pollution that causes cancer, or a spiritual deficiency? Both? Split the difference?
Why does pollution cause cancer in your world?
In the real world pollution causes cancer because it increases the incidents of SOMATIC MUTATIONS.
Thus indicating, along with billions of other points of data, that Cancer is a GENETIC disease.
Be annoyed with yourself - and whoever taught you what you think you know about the mind of God and its applicability to making factual determinations about the natural world. It is well deserved.