What tool is often used to control bleeding in a rabbit's toenail injury?

Styptic powder is specifically designed to stop bleeding by constricting blood vessels and promoting clotting. When a rabbit suffers a toenail injury, the exposed tissue can bleed significantly, especially if the nail is cut too short and exposes the quick, which contains blood vessels and nerves. Applying styptic powder directly to the area helps to quickly reduce bleeding and seals the wound, making it an essential tool in emergency first aid for minor injuries like toenail cuts.

Other choices, while potentially helpful in other situations, do not effectively address the immediate need to stop bleeding. A tourniquet can cut off blood flow completely but is inappropriate for small injuries due to the risk of tissue damage. Antiseptic solutions are important for preventing infection once a wound is addressed but do not help control bleeding. First-aid tape may be useful for securing bandages, but it does not stop bleeding on its own. Therefore, styptic powder is the most suitable tool for this specific situation involving a rabbit's toenail injury.