Damn it! I have been chased by a few cows before and I know what you mean about the "look in their eye"! I used to have a steer that was mean as the dickens and I would look at him and envision porterhouses and t-bones & brisket! Eventually that's what he became! LOL YOu might want to consider bringing a small air horn with you. You can find them in any sporting goods department (boating section). A loud noise usually scares them.
Donít tell the Lord how big the problem is, tell the problem how big the Lord is.