Keystone or Guillotine Dehorning

A keystone dehorner has two handles that move a blade downward against a plate or another blade, slicing through the base of the horn and surrounding skin.

Advantages: Can be used in older cattle with large horns.

Disadvantages: Greater risk of exposed sinus, infection and blood loss; painful; may lead to set-backs in overall health and performance, including weight loss; requires follow-up care; poses risk of injury to the animal and handler.