SANTA ANA, CALIF. ? Matt Good has never dressed his dogs in Halloween costumes. Until now.

When the holiday rolls around this year, Good will clothe his beloved Shrek, an 8-month-old Dogue de Bordeaux, in a red tight tank top that reads: “Devil Dog.” He’ll complete the canine’s costume with red glittering horns on his head.

Good paid $32.50 for the outfit at Muttropolis, a pooch boutique at the Fashion Island shopping center in Newport Beach, Calif.

People like Good have led the National Retail Federation, the world’s largest retail trade group, to offer statistics on pet costumes this Halloween season, for the first time.

“It’s a trend we began noticing last year,” said Kathy Grannis, NRF spokeswoman.

This Halloween, NRF predicts, 11 percent of the people who celebrate the October holiday will don their cherished pets in costumes. That amounts to 7.4 million households nationwide, according to the NRF’s research.

Irvine, Calif.-based CostumeHub.com is reaping the benefits. Its revenue for pet costumes rose 15 percent so far this year vs. last year. To pounce on this rising popularity, next year it plans to double its animal selection to roughly 60 outfits.

Already this year, Target, PetSmart and Muttropolis expanded their offerings of pet costumes. (It’s still a relatively new business for Target, which only began selling pet costumes two years ago.)

The Newport Beach Muttropolis stocks more than 20 Halloween outfits, roughly twice as many as it did last year. It also began carrying costumes in early September, about a month earlier than last year. As a result, sales have jumped 85 percent this season compared to last year’s.

Last Halloween, popular pet costumes were devils, pirates and angels, according to Muttropolis. This year, what’s hot are animals pretending to be other creatures. Think skunks, spiders, lobsters, ladybugs, bumblebees and butterflies.

“It’s kind of funny,” Muttropolis spokeswoman Dana Humphrey said.

Wal-Mart even sells a $13 cat costume for the dog who wants to cross-dress as a feline.

At Three Dog Bakery in Newport Beach, even before the costumes arrived, people were asking the store to call them when it gets specific costumes in, said owner Sandy Deem. Among the popular requests: a lion outfit for $36.

While not part of the animal theme, one quirky costume appears to be flying off the racks this year: an Elvis wig for cats, PetSmart spokeswoman Jennifer Ericsson said.

Retailers aren’t just selling costumes for pets. They’re also hosting parties, photo ops and fashion shows.

Many PetSmart stores will throw a free Howl-O-Ween Costume Party.

For the first time, the Neiman Marcus at Fashion Island will have a doggie fashion show. The catwalk celebrates Juicy Couture’s launch of a doggie fragrance, or what it dubs “Pawfum.” Pooches will model Muttropolis’ latest fashions and Trick-or-Treat costumes.

Last year, Muttropolis’ Halloween pet portrait attracted about 60 people to the Newport Beach, Calif., shop. This year’s event, held Sunday, lured more than 100 pet owners.