Tetanus – An extremely unpleasant disease to witness which is usually fatal. A horse doesn’t even need to leave home to be at risk of picking up tetanus. A small puncture wound can be all that is required for the bacteria to enter and in most cases the disease proves fatal despite attempts at treatment. It is caused by bacteria found in soil and horse droppings, which enter the body through wounds or punctures in the hoof. Horses will develop muscle stiffness resulting in a “rocking-horse” stance and “lock-jaw”.