Ruth Regina and her dog Wiggles, who models one of her wigs, at the Javits Center.

Celeb worship has totally gone to the dogs. Pet owners who don't dote enough already on their four-legged friends can now cap their fashionable critters with wigs and weaves modeled after Posh Spice, the Beatles - even The Donald - thanks to a line of doggy do's by Ruth Regina, wigmaker to the stars.

The Hollywood hair legend, who has coiffed cultural icons from Judy Garland and Elvis Presley to former President Richard Nixon and Heidi Klum, joins the pampered pet industry with Wiggles, a line of toupees and extensions tailored to teacups and Great Danes alike.

"This is the dog's day," says Regina, visiting the New York International Gift Fair at the Javits Convention Center this week with her own Yorkie (named Wiggles, of course).

The teacup pup sports a hot pink "Yappy Hour" wig topped with a matching pink bow à la Pebbles Flintstone. "When I saw dogs in tiaras and opera clothes and workout clothes and jewelry being carried around in $7,000 alligator bags and Chanels, I said, 'Oh, why not a wig for a dog?'"

According to the American Pet Products Manufacturers Association's 2007-2008 National Pet Owners Survey, pet ownership and spending on pets are both at an all-time high. Expenditures hit $38.5 billion in 2006, and the survey estimates a whopping $40.8 billion will be spent on U.S. pets in 2007. "Over the past two decades, we have come to realize people consider pets as a part of the family and treat them accordingly," states APPMA president Bob Vetere in the study. "That has led to the evolution of everything from new and improved services and travel accommodations to food and medicines."

Not to mention weaves. It was only a matter of time before animal accessories wigged out like Britney Spears.

With half a century of styling under her belt (working as makeup director on "The Jackie Gleason Show" and prepping the Beatles for their historic "Ed Sullivan Show" appearance), Regina's mane pieces mostly evoke old Hollywood glam. They include the cherubic "Doll Face," "Shirley Temple" ringlets and "The Penny," to more contemporary cuts like Donald Trump's comb-over, the dreaded "Marley" and "Joe the Bartender." They range from $24.95 to $29.95 and are available on www.wigglesdogwigs.com.

"A woman's hair is her crowning glory," says Regina. "If a dog has all the other accessories, why not top it off with a beautiful hairpiece?"

Yet this sounds barking mad to some animal rights activists, including Dr. Stephen Zawistowski, executive vice president of the ASPCA. "If one was an entertainer I could imagine why someone would use wigs or hair extensions for their dog," he says. "But there are better methods for enjoying the company of your pet." He warns the wigs pose potential risks such as allergic reactions and skin irritation, or long wigs getting tangled on external objects or the dog itself, leading to injury.

"It's important that people understand the personality of their companion animal in order to determine their comfort level with accessories," he says. "My beagle, Morgan, would not appreciate wigs or hair extensions. Though I must admit that he does have a pair of antlers for the holidays."

Regina assures the wigs are custom-designed with dogs in mind. "I made sure that the ears would come out, that it would fit comfortably under and around the head, and that it would weigh as light as a feather," she says.

"I get all kinds of reactions from people, but I get more smiles than anything else."