Unfortunately, coyotes that show no fear of humans or aggression towards humans and pets have to be taught a lesson. By all means, throw things at them or hit them with something as others have said. This behavior is not tolerable and once they learn that people are not a threat, they will become more bold. I would also call animal control or a wildlife official and tell them of your close encounters. They may come and remove the coyote from the area and euthanize it.
ETA: I saw someone mentioned dog collars being found in a den. I know if one study somewhere near Los Angeles, it would found that the coyotes around there were mostly living off domestic cats and cats made up 75% of their diet or something like that. I don't know about dogs. Out in the desert, you see coyote-dog hybrids, so perhaps the large dogs become mates.
ETA: I saw someone mentioned dog collars being found in a den. I know if one study somewhere near Los Angeles, it would found that the coyotes around there were mostly living off domestic cats and cats made up 75% of their diet or something like that. I don't know about dogs. Out in the desert, you see coyote-dog hybrids, so perhaps the large dogs become mates.
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