This article is from the Frisbee Dogs FAQ, by Kevin Robair with numerous contributions by others.
The catch and retrieve event is the backbone of most Frisbee dog
events. It consists of a timed round where teams, which consist of one
dog and one thrower, attempt to make as many successful throws/catches
as possible before time runs out. Generally, the field is a rectangle
laid out with lines representing distances from the throwing line,
much like a football field with the throwing line being the end zone.
Teams score more points for longer throw/catch combinations. Usually
only one disc may be used. Rounds usually last one minute.