A coyote can breed with a wolf, a wolf can breed with a dog, a dog can breed with a coyote. This is one species of animal with different variations.
Hybrids to occur in nature. There is some debate among wildlife biologists whether red wolves are a separate species of themselves, or simply wolf/coyote hybrids. No one that I know of or have talked to, except you, contends that wolves and coyotes *are* the same species.
A lion can breed with a tiger. What does that tell you?
A coyote and wolf are two different species. They do not breed in the wild. You must differentiate between selective breeding and natural selection.
Don't get confused by Darwin's example of selective breeding in Origin of Species. He didn't mean to say it was identical.