Notch, a 7-year-old border collie, clears an obstacle at the Westminster show. Border collies are the most prevalent of the 76 breeds entered in the agility portion of the show, and they're agility powerhouses: driven, flexible and fast.

Handler Alan Davis, of Pen Argyl, Pa., cheers on Sunny, a Siberian huskie, in the agility portion of the Westminster show.

An unidentified dog navigates an obstacle course in agility portion of the Westminster show.

Silver, left, Sirius, center, and Sterling of the Greater New York Havanese club participate in the meet the breed portion of the 140th Westminster Kennel Club Dog Show on Saturday in New York.

Maybelline, a 7-year-old Pug, is ready for action in the agility portion of the Westminster dog show.

Vislas and their owners wait on the sidelines for the agility portion of the Westminster show.

Morgan, a 13-year-old Chinese crested, and his owner Taylor Potter of North Bergen, N.J., wait on the sidelines to compete in the agility portion of the Westminster show.

A Spanish Water Dog is one of seven breeds that are competing for the first time at the Westminster dog show.