What type of animal is a "lurcher"?

A lurcher is a crossbreed sighthound that is mixed with a terrier or herding dog. Lurchers have their start almost 400 years ago when English laws prevented anyone who was not of the gentry class from owning a hunting dog. The lurcher was almost a workaround since it was partly from herding roots. The mix of the sighthound gave the dog some instincts to grab prey. The laws allowing non-nobility to hunt were not rescinded until the 1800s.

Lurcher is an old English term for a crossbred dog; specifically, the result of mating a sighthound with a dog of another type, typically a working breed. The term was first used with this meaning in 1668; it is considered to be derived from the verb lurch, apparently a variant form of lurk, meaning lurk or steal.

https://en.wikipedia.org/wiki/Lurcher