Spaying instruments and catheters for large animals, including cats and dogs, available at Surgical Holdings Veterinary. Spaying is a common term used to describe the veterinary surgical procedure known as an ovariohysterectomy. Spaying instruments are used during the surgical removal of the ovaries and uterus in female animals. All of our stainless steel veterinary spaying instruments and catheters are manufactured in accordance with BS 5194. This ensures every spaying instrument and catheter has the correct composition so that they can be fit for purpose and perform the action they were designed for.