By not providing food, water, shelter or veterinary treatment when they are sick.
Yes they can become sick from eating toxic plants, they can get worms and they can get respiratory infections.
No sheep are herbivores, they will not eat humans.
what are the threats to bighorn sheep by humans
Yes
Not sheep, but lambs that are sick or weak.
No, walnut trees are not poisonous to sheep at all. The sheep can the leaves from the walnut tree and not get sick.
Sheep can catch viruses which can make them sick but they don't have viruses all the time.
It is not actually a proven fact that humans are smarter than sheep. Humans just know more about being a complex life form.
A tongue twister.
By providing feed, water and shelter. By vaccinating sheep against various diseases that can make the sheep sick and by drenching them for worms.
The sense of smell is the same for both humans and sheep. Sheep use their sense of smell to find food and to sense other sheep around them.