suzanne knox on top of the screen with ricky bobby. pepin on the bottom of the screen, the big dog. - [shellene] both larger dogs, both fast dogs. you said we saw them in agility, usually, agility dogs are who compete in weave because they know the obstacles. there's just a much longer track. - [trace] oh, look at this! pepin with a little pep in the step! wow, 14.65, and based on their agility run earlier, this is really impressive. - [shellene] oh, absolutely. they were both super-fast when we saw them compete in agility, both fast here, pressing each other. again, right now, these are timed runs, so the fastest times are what will advance. these two definitely quick, definitely getting through the course clean, and fun to watch. - [trace] all right, so nimble is the dog, cynthia horner, the handler, up against kim terrill, and her dog, rise. heat number four. - [shellene] nimble, the little five-year-old, all american on the bottom, three-year-old border collie, rise on the top. head-to-head in the first set of weaves. - whoa! - wow