I feel that its a myth that if there are coyote on your land all the fox will be killed, i think its only in a situation like a fox is feeding on a carcass or something and the yotes come in, then i think the yote will kill the fox over competition for food, but i dont think yotes look for foxes to purposely kill them.

Made a few sits tonight in the full moon and snow storm, it felt like the perfect night to get a coyote to come in due to a growling stomach. I did manage to have some deer come check out the rabbit distress but no yotes. My buddy and i setup just out of view from where a grey fox had come across the field and driveway back toan oldfarmers house tho, so we had a response. Just so happened we setup on the wrong side of a bend in the driveway where the treeline came to a point, woulda had him no questions about it if i had just posted up 20 yards shorter. My heart dropped to my feet when on the walk out we saw a brand new set of track INSIDE our tracks on the driveway but i guess tahts why they call it hunting and not killing.