IF you want to keep a dog that can best coyotes—get a Great Pyranese . They look like a huge lumbering fool, but they can turn on the speed & take down a coyote. They are used extensively by sheep ranchers all over the world to keep predators at bay. Very good protection for the family, also.
I have a year old female. She replaced my old male who died. I once watched him take out a stray dog that wandered into my pasture. He was about 800 feet from the dog, I was about 400 feet from the dog trying to shoo it out before Reno could spot him, but to no avail. Reno spotted him and nailed him about 50 feet from it getting through the fence which was about 1,000 feet from when Reno first saw it. It was over pretty fast and that dig never had a chance. Just a furry white blur followed by a lot of fur flying.