The lasso is part of the Vaquero/Buckaroo tradition of the Spanish-speaking West. The word "lasso" is in itself Spanish in origin referring to the noose of the rope. The need to throw a rope from horse or on foot, as a way to capture cattle is intimately tied to the concept of the open range. The tradition of working cattle in Britain and Ireland relies on fencing, keeping cattle on pastures - limited land with rich grass. Cattle can run - but they can't run far. Ultimately, it is possible to "herd" cattle on foot and to coax them into the desired direction and destination. This tradition transferred seamlessly to the Atlantic seaboard where fencing was the dominant practice.

The arid West requires extensive real estate to support a cow because grasses are scarce. The adaptation to this environment was the open range - land without fences with cows allowed to roam free. There was/is an annual "round-up" where cattle were/are captured, offspring were/are branded, and the fate of each animal was/is decided - sale or butchering or release back to the open range, etc.

Lacking fences to hem in cattle, the only practical means to "corral" or to "round up" the cattle was to pursue them on horseback and to capture them by means of throwing a lasso. This remains the standard practice in much of the West where cattle are still released to an open range.