Final answer:
The proper vein to use when restraining a cat to draw a large amount of blood is the jugular vein while the patient is in ventral recumbency.
Step-by-step explanation:
When restraining a cat to draw a large amount of blood, the proper vein to use is the jugular vein while the patient is in ventral recumbency.
The jugular vein is commonly used for drawing blood from cats because it is large and easily accessible. It is located on the ventral side of the cat's neck, just below the jawline. To access the vein, the cat should be positioned in ventral recumbency, which means lying on its back.
When drawing blood, it is important to use proper technique and follow veterinary guidelines to ensure the safety and well-being of the cat. It is also important to use appropriate equipment and take precautions to prevent infection and minimize stress to the cat.