What type of extension devices are commonly used to handle aggressive or frightened animals?

Muzzles are commonly used to handle aggressive or frightened animals because they are designed to safely restrain an animal's ability to bite. This is crucial in situations where an animal may feel threatened or reactive, as it helps protect both the animal and the handlers. Muzzles can foster a sense of security during handling and transport, allowing veterinary staff or animal care professionals to assess or treat the animal without the immediate risk of bites.

In contrast, items like leashes, collars, and harnesses serve more for general control and restraint, but they do not provide the same level of safety against biting. Leashes and collars can help guide and secure an animal, while harnesses distribute pressure more evenly across the body but still do not prevent biting. Therefore, muzzles are specifically suited for scenarios involving aggressive or frightened animals, emphasizing the importance of choosing the right tool for the context of animal handling.