What is a key characteristic of a slip leash?

A slip leash is specifically designed to tighten around an animal's neck when tension is applied, which helps in controlling the animal effectively without requiring extensive hardware or complex fastening mechanisms. The ring at one end is integral to its functionality, allowing the leash to slip tight when pulled, providing both security and ease of use.

This design makes it suitable for a variety of animals, as it can easily adjust to different sizes, which is why it's incorrect to say it is only for large animals or that it cannot be used with small pets. Additionally, while slip leashes can certainly be used for training, their versatility allows them to serve broader purposes, making it inaccurate to define them solely as training tools. Thus, the presence of the tightening ring is what distinguishes slip leashes and is a fundamental characteristic of their design and application.