Before attempting to dehorn the animal, it should be securely controlled by ropes in a stanchion or by casting.
"Special Report on Diseases of Cattle"
U.S. Department of Agriculture J.R. Mohler
In most localities there are men who are well equipped to dehorn cattle, and able to perform this operation for a very moderate fee.
"Common Diseases of Farm Animals"
R. A. Craig, D. V. M.
It is a good time to dehorn them when about one year old, as they will be more peaceful subsequently than if the horns had never been allowed to grow.
"Pratt's Practical Pointers on the Care of Livestock and Poultry"
Pratt Food Co.