DOGS!!! This year I had some dogs ruin my hunts a few times. Once I was hunting and a dog came running through. That was bad enough, but then some people following the dog walked off about 100 yards yelling for the dog. I've also left my house in the morning and got into the woods a good ways and looked behind me and saw MY dog following me.

Cats, coyotes, and cows are some other ones. A doe was feeding out in front of me one evening and a cat (not a house anywhere near) walked out and scared her off.