Which of the following is NOT a type of hemostat?

A spay hook is not considered a type of hemostat. Hemostats are surgical instruments specifically designed to control bleeding by clamping blood vessels or tissue during procedures. Both the mosquito and Kelly are types of hemostatic forceps; the mosquito is a smaller version used for delicate tasks, while the Kelly can handle larger vessels due to its increased size and jaw design.

In contrast, a spay hook is a tool used primarily in the spaying procedure to help lift the uterus and expose the ovaries for removal. Its function does not involve clamping for hemostasis, which is why it does not fall under the classification of hemostatic instruments. Understanding the specific roles of surgical instruments is vital for their appropriate use in veterinary practice.