Prions very rarely affect other species, vCJD was unusual in that it was a cow cannibalism illness (mad cow disease) that also caused fatal mental illnesses in humans.

Sheep prions mess up sheep but not us, you’re incredibly unlikely to get a prion disease from a random wild animal, and you’re very safe if you only take healthy animals

The only populations that still live off the land that suffer prion disease are those that practice cannibalism. All of them eat brains. Humans probably evolved taking brains from lion kills; bashing the skulls open with rocks the same way chimps bash open nuts