The 137th Annual Westminster Kennel Club Dog Show airs tonight at 8 p.m. on USA Network. There was plenty of excitement before the show at the Hotel Pennsylvania in New York City. Check out these photos of the dogs checking into their hotel, attending press conferences, working out, getting groomed, and dressing up for the annual pre-show fashion show.

A pair of Neopolitan bull mastiffs named Paparazzi and Ruben rode the elevator with their owners after checking into the hotel.

Two-year-old Azlo, a Dogue de Bordeaux, waited in the lobby for his room to be ready.

A miniature schnauzer named Mocha sat in a baby carriage while waiting in the lobby.

Mac, an Australian terrier from Florida, ran on a treadmill in a doggie spa inside the Hotel Pennsylvania.

Dogs used the indoor bathroom at the dog spa in the basement of the hotel.

Turbo, a Russell terrier, at a press conference.

Leslie Simis groomed her dog, Sharona, a miniature poodle, at the dog spa at the Hotel Pennsylvania.

An Afghan hound drank water from a glass during a press conference.

Treeing Walker coonhounds stood at a press conference kicking off the 137th Annual Westminster Kennel Club Dog Show. The Treeing Walker coonhound and Russell terrier are new breeds to the show this year.

Perla, a Russell terrier, was introduced during a press conference. Russell terriers joined Treeing Walker coonhounds as the two new breeds in the 137th Westminster Kennel Club Dog Show.

Alliyanna, a Chihuahua from Alabama, attended the New York Pet Fashion Show at the Hotel Pennsylvania.

Participants in the New York Pet Fashion Show line up backstage.

Walking the runway at the New York Pet Fashion Show.

Bob Shaughnessy holds his Havanese at the fashion show.

Eli, a Chihuahua from Manhattan, posed on the red carpet at the New York Pet Fashion Show.

The 2012 Best in Show winner, Malachy, a Pekingese, during a press conference.