Describe the role of a muzzle in animal restraint.

The role of a muzzle in animal restraint is primarily to prevent biting and protect handlers during examinations or procedures. Muzzles are designed to securely fit around an animal's snout, allowing for safe interaction while minimizing the risk of injury to both the animal and the handler. This is particularly important in situations where an animal may be frightened, in pain, or feeling threatened, which can lead to unpredictable behavior.

Using a muzzle allows veterinarians and handlers to safely perform necessary procedures, such as examinations or treatments, without the constant worry of being bitten. It enables the handler to maintain control of the situation while ensuring the animal's safety as well.

The other options do not accurately reflect the primary purpose of a muzzle. For example, enhancing aggression goes against the principle of humane treatment, restricting movement completely would not be a benefit of a muzzle, and training for future handling is a separate process that involves more than just using a muzzle. Thus, the correct framing of a muzzle's purpose emphasizes its role in safety and protection during handling rather than any form of aggression or total restraint.