What is a key characteristic of sight hounds?

Sight hounds, by definition, are a group of dog breeds specifically bred to hunt by sight rather than by scent. This means that they rely on their keen vision and swift speed to chase down and capture prey. The ability to see and track movement from a distance is a critical characteristic of sight hounds, distinguishing them from other types of dogs that may rely more on their sense of smell.

While endurance is a trait of some hounds, particularly those used for long-distance pursuits, it is not exclusive to sight hounds, as other breeds are also built for endurance. Similarly, the use of dogs for guarding or therapy involves different breeds and skills, making those characteristics irrelevant to sight hounds themselves. Thus, the defining feature is their pursuit of prey by sight, making the correct choice focused on their vision and hunting method.