I got a buck with the wheels years ago. Double lung hit, watched him run 30 yards and lay down. I backed out a bit, called my bro and had him come with a latern. The blood was profuse. Both sides of the trail, like someone was trying to run with a filled 5 gallon bucket. Then, after about 200 hundred yards, nothing. Not even a drop. We heard leaves crunching now and then while trailing, and didnt give it much thought. After a solid hour of looking, no more blood. Backed out, called a dog search guy and I waas amazed at how quickly he responded. Within an hour of backing out, we were all back in there, and found my deer. It had run straight up a very steep hill leaving not a single drop of blood.
We found his skeleton. The shoulder he was laying on and the head were about the only things left. I called DEC in and was bluntly told I needed to kill coyotes, and sorry about your tag.
The best I can figure is that the yotes jumped him out of his bed and ran him until he fell over dead, about 300-350 yards from the shot, mostly UPHILL.
Moral of the story, sometimes the coyotes get the deer, even when the shot is perfect. They capitalize on every meal they can, and a mortally wounded deer is easy pickings for them.