This thread has got to be total bull****--and I hope no one actually takes any of this advice....
Dogs will vary in their ferocity and ability and weakness. Just with any wild animal, its got natural weapons that you do not. Try and beat the thing down with whatever you can find--if there's nothing around than you'd have a better chance with a covered foot than a bare arm. Slamming a dog or shoving your thumb in it's eye will usually get them to let go if they're biting.
Why you walked up behind the coyote is beyond me...you asked for the trouble to be honest.
"I don't know if anyone is known with the art of "sitting on your couch" here, but in my eyes it is also to be a martial art.
It is the art of avoiding dangerous situations. It helps you to avoid a dangerous situation by not actually being there. So lets say there is a dangerous situation going on somewhere other than your couch. You are safely seated on your couch so you have in a nutshell "difused" the situation."