Here's a nasty brutal tool. I watched these shears in action when I was a kid. The cow was secured in a stanchion and then had its head tied down to the floor with a rope. The jaws are placed around the base of the horn, and a man with all of his strength and weight on the nearly 3 feet handles, "snips' off the two-plus inch diameter horn. The cow explodes in pain and shock, blood squirting everywhere.
The guy then packed some gauze into the wound and within minutes the cow was back eating. Jeez, there must be a better way.