I shot a coyote at about 10 yards, if that, walking towards me with a 308 175gr matchking.
No blood, could not for the life of me find an exit wound, thing dropped like a ton of lead fell on it.
Dragged back across the snow-covered field, no blood.
Buddies grandfather took it to skin it and sell it to his fur buyer, said it looked like someone stuck a 12 gauge inside the thing and shot, there were holes everywhere on the off-side of the pelt.
Bullet entered and just exploded.
No blood, in snow, blood trails are a luxury with these things, in my experience. Then I've not really been the type that hunts them when they've got their thinner coats... that may change the "rule"
Though I do hate losing an animal, any, it hurts, coyotes are the devil to find.