Take Sophie, for example. With perfectly trimmed pompoms and fluffed out fur, she’s the very essence of poodle pulchritude.

What Westminster won’t tolerate, though, are PEDs — performance-enhanced dogs.

That means no tattooing a boxer’s nose to make it more black, no braces for a pointer to straighten its teeth, no removing a basset hound’s inner eyelid to improve its appearance.

“It goes against the spirit of showing dogs in their appropriate state,” Westminster President Sean McCarthy said Monday, the opening of the two-day show.

Cosmetic surgery isn’t permitted, either, along with steroids. Yet detecting illegal drugs is virtually impossible while a dog has its few minutes in the ring.

“Our judges are not all veterinarians,” longtime Westminster television host and breeder David Frei said. “They can’t tell if a dog is on greenies.”

There were 2,721 entries this year, though some missed out after getting stranded by the recent blizzard that hit the Northeast. The 137th Westminster features dogs in 187 breeds and varieties with a pair of newcomers, the treeing Walker coonhound and the Russell terrier.

A highly ranked American foxhound known as Jewel that likes vanilla milkshakes won the hound group Monday night at Madison Square Garden.

“I call her my tomboy princess,” co-owner, breeder and handler Lisa Miller said.

A bichon frise called Honor won the nonsporting group. He is co-owned by Ellen Charles, also the co-owner of Jewel.

“My lucky night,” Charles said.

An affenpinscher called Banana Joe took the toy group. Known for his monkeylike face, he earlier won best of breed honors for the third straight year.

An old English sheepdog earned herding honors. It was quite a surprise by Westminster standards — 90-pound Swagger is just 20 months old and had only entered three previous dog shows.

“Such a cool dog,” breeder-owner-handler Colton Johnson said.

The top working, sporting and terriers come Tuesday, and judge Michael Dougherty was set to pick the best in show shortly before 11 p.m. on the USA Network. Jewel, plus a Doberman playfully called Fifi and a big-winning wire fox terrier called Sky were among the favorites to walk off with prized silver bowl.

Sophie the standard poodle did her best, yet didn’t advance. She sure got a lot of attention backstage, with little girls petting her white coat and nuzzling her muzzle. When co-owner Jay Ponton of Norfolk, Va., moved close, Sophie chawed on his nose and licked his face.

There were pump and spritz sprays on the tables in the poodle grooming area, but none of the heavy-duty aerosol hairspray cans that are a no-no. It takes plenty of primping to get poodles ready to compete, though there are limits.

“If you’re putting in teeth, that’s a different beast. It’s a different animal,” said Roxanne Wolf of Baltimore. She’s the fiancee of Sophie’s handler, Kaz Hosaka, who guided a miniature poodle to the 2002 Westminster crown.

Some things are OK. Corn starch is often used to get water off a coat, and that helped on a rainy Monday as dogs piled into the halls on the Hudson piers for early judging.

Crufts, which expects to show 25,000 dogs next month in Birmingham, England, might change regulations that have been in place for nearly a century.

“The Kennel Club set up a working party to look at the rules surrounding the use of hairspray, chalk and other products at dog shows, and whilst this review goes on the strict prohibition of these substances remains in place, including for Crufts 2013,” club secretary Caroline Kisko said.

“The Kennel Club regulations state that the use of products that could ‘alter the natural color, texture or body of the coat’ may not be used,” she said.