What agent is commonly used to stop bleeding after cutting the quick of a dog's nail?

The use of a silver nitrate stick is a common and effective method for controlling bleeding, particularly in the situation described where the quick of a dog's nail has been cut. Silver nitrate works by chemically cauterizing the tissue. When applied to the cut area, it promotes a localized coagulation effect that helps to seal the blood vessels and thus stops the bleeding. Additionally, silver compounds have antimicrobial properties, which can reduce the risk of infection at the site of the injury.

In comparison, while hydrogen peroxide is often used for cleaning wounds, it does not effectively control bleeding and can cause further irritation to the tissue. Sodium bicarbonate is not an agent employed in this scenario; it is primarily used as an antacid or buffering agent. Aluminum sulfate, although used in some medical contexts, is more commonly associated with water purification and wound treatment in different capacities but does not serve the purpose of stopping bleeding as effectively as silver nitrate. Thus, the choice of silver nitrate stick is justified and illustrates the best practice for managing this specific type of injury.