The European standard seems to be to use higher INRs than we do, especially for mitral valves.
I don't know if coyotes kill foxes but it would seem highly likely. Foxes seem more stealthy and coyotes seem more aggressive.
One dog isn't much of a match for a mountain lion. There is a story told around here of someone sitting on their deck having coffee on a weekend morning. Their 100 pound black lab was in the yard. They had a 6 foot high wooden fence around their yard. A mountain lion jumped the fence, killed the dog with a bite to the neck and jumped the fence with the dog in its mouth. It happened so fast that the people did not even get out of their chairs before it was gone.
This happened in a season of severe drought. In 2003, we had only 3 inches of rain all year instead of our usual 12 inches annually.
That drought brought lots of bears out of the mountains because there was nothing for them to eat. One of my wife's friends had one rip the window out of her house frame and all to get in and eat. Fortunately they were not home.
The key to dealing with a mountain lion is to stay upright. They are programmed to attack things with four legs. If you bend over to pick up a stick or a rock, you increase the risk of attack.