Furby (right), a Pekinese, is dressed as a knight as he waits with friends for his portrait at Muttropolis in Newport Beach, Calif.

MCT / Paul Rodriguez

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 eight-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.

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

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

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

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.