The primary purpose of muzzling a dog is to achieve which of the following?

The primary purpose of muzzling a dog is to prevent it from biting. Muzzles are specifically designed to reduce the risk of injury to people and other animals by restricting the dog's ability to open its mouth fully. This is particularly important in situations where a dog may feel threatened, scared, or in pain, as these circumstances can trigger aggressive behavior. By using a muzzle, handlers can ensure safety during examinations, grooming, or handling when there is uncertainty about a dog's temperament.

Other options, while they might appear relevant, do not accurately reflect the main intent of using a muzzle. Muzzling does not effectively control barking, as it allows for some noise but restricts biting; it does not limit movements during an examination in the same way a restraint might; and enhancing comfort is typically not a primary concern when using a muzzle, as it can actually cause discomfort or anxiety for the dog if not fitted properly. Thus, the most accurate answer aligns with the goal of using a muzzle for safety reasons.