Foot abscess, also known as pus in the foot, is very commonly seen in horses, ponies and donkeys. They are generally very painful with a sudden onset. Abscess result from a localised bacterial infection developing inside the hoof wall or under the sole. This typically develops after a penetrating injury through the sole, or by tracking up the white line (the seam between the sole and the hoof wall).

If you are treating a horse with an abscess, this short video may help, showing you how to apply the poultice.