Sophia, a calico tabby from Wellfleet, Massachusetts. "My kitty Sophia daintily poses in a pretty pink tutu," writes digitalteacupdotcom.

Ralph and Caesar, a pug and an Olde English Bulldogge from Carmel, Indiana. "The boys are posing for their mug shot after being caught stealing cookies from the cookie jar!" writes WoofsMom.

Tucker Monken, a Siamese mix from Indianapolis. "Tucker's Halloween costume from last year. Avast and AHOY!!!" writes tsorningold.

Ralph, a pug from Carmel, Indiana. "Ralph is posing as the Great Pumpkin and is definitely the BIGGEST pumpkin in this patch," writes WoofsMom.

Chico, a Long-Hair Chihuahua from Brooklyn. "Surf's Up, Dude! Chico decided to have a Hula-ween party and celebrated in his surfer clothes. Bow-abunga!" writes StellaBlanca.

Contributed by jennyluhu

Tuffy, a Chipoo from Yonkers, New York. "Don't mess with me!" writes 3ChiMom.

Tino, an Italian greyhound from Prescott, Arizona. "Two-piece Dalmatian sweater and hat with ears, handmade from my own pattern," writes hollyjm.

Capri, a Rottweiler mix from Boston. "She has her wicked-witch times...but overall is a good witch," writes seaver12.

Fianna and Dazzey, an Irish Wolfhound and a mixed breed from Napa, California. "Fianna and sister Dazzey hamming it up at the dog park, wearing their Halloween collars and hoping none of their doggy friends see how silly they look," writes fianna.

Aladdin and Phoenix, golden retrievers from Plainview, New York. "Phoenix is an organ grinder, pushing his home-made organ on a cart," writes sistersfan. "Aladdin is his monkey, collecting tips in a tin cup that he holds in his mouth."

Roxy Gonzalez, an English bulldog from Miami Beach, Florida. "Our beautiful bully, Roxy, was a birthday princess for Halloween," writes monikaval. "Her birthday is near Halloween, so we thought the hat was perfect. Unfortunately she still had a little too much cake, and her dress was too tight."

Walker, a cairn terrier from College Station, Texas. "Handsome and comical ... that's Walker!" writes lisawcbs.

Sophie, a Pekingese from College Station, Texas. "What a pretty pumpkin!" writes lisawcbs.

Pookie, a rescue cat from Berrien Springs, Michigan. "It was Halloween at our home when we lived in Running Springs, California," writes cloee57. "Later that day, we went down the mountain to Petco to enter her in a photo contest, and while we were gone the fires ravaged the mountain area, and we couldn't get back home. So this was a special day -- because of the Halloween event at Petco, we had our pets with us and we were all safe. The pumpkin got left behind!"

Stitch, a pug from Johns Creek, Georgia. "Stitch the Pug as Darth Vader," writes Tiger1515.

Iago (a.k.a. Iggy), a Bengal cat from Pittsburgh. "Our precious little kitten does not normally have a snaggletooth; however, I'm rather certain he was not on his A game at this point in the evening," writes natashahazelwood.

Emmett, a Long-Coat Chihuahua from New York City. "We have been listening to a lot of Lady Gaga lately, and it inspired us to adorn Emmett with this gorgeous pink Gaga-ish wig," writes carluvsemmett.

Riley, an Olde English Bulldogge from Chicago. "Riley is dressed up and ready to go trick-or-treating," writes BlondiesBulldog.

Texas, a Boston terrier from Tallahassee, Florida. "Halloween a few years back," writes historia34. "I made the costume, Texas managed to wear it with some dignity. My sister did the inspired set styling in the backyard."

Bandit Rubio, a Chihuahua from New York City. "Bandit Rubio the rescue!" writes BANDITRUBIO. "Our Chihuahua wears an exact replica of the actual golden Elvis suit on display at the Aria in Las Vegas. His bling and Elvis sunglasses are actually Elvis Christmas ornaments, and the guitar on his back is a replica of an Elvis guitar, complete with autograph by the King. Outfit created by Anthony Gil de Rubio."

Phantom, a domestic shorthair from Fargo, North Dakota. "Phantom is one of our long-term foster cats," writes daneroo. "He has about 80 to 90 percent vision loss, but I have a feeling he can see right through you when he is feeling devilish! He knows if you've been good or bad."

Peanut Butter, a French bulldog from Alexandria, Virginia. "'Arrgh,' says Peanut," riddlita writes. "He must have liked being a pirate, because he kept his hat on for hours!"

Super Dave, a Sealyham terrier from Hollister, California. "Up, up, and away ... it's Super Dave," writes Sealygal. "Super Dave loves his costume. He would leap around like he had super powers and would save the world."

Jack, an Airedale terrier from Idaho. "Jack, the rescued Airedale terrier," writes nidahoadt.

Chuy, a Chihuahua from Virginia Beach, Virginia. "Chuy loves the beach and happened to catch himself a tasty little fish," writes ChuyBell.

Sundance, a Rhodesian ridgeback from Miami. "A 107-pound ridgeback makes for a formidable ghost and a great escort for the kids," writes Airdawg.

George, a 14-week-old English bulldog from Laurel, Maryland. "George is ready for Halloween!" writes AmyRazmus.

Girlie, a Dorset ewe from Ontario, Canada. "Girlie doing her best Robin Hood," writes VetChick.

Spazz, a domestic shorthair from Howell, Michigan. "A wonderful 10-year-old rescue who tolerates it all, but who lives like a queen in return," writes afitch.

Boo, a Rottweiler from Groton, Connecticut. "This is Boo. She really is my little pumpkin, and she LOVES treats!" writes kristi1074.

Kainoa, a Bengal from California. "Happy Halloween, everyone!" writes dotzzz.

Spencer and Reggie, Yorkies from Pasadena, California. "Gondoliers," writes CDNCARLA.

Annie and Bella, a schnauzer and a Yorkie from Belleville, New Jersey. "Annie the schnauzer is four years old, and Bella the Yorkie is 13 years old," writes annp424.

Abby May, a dachshund from Tucson, Arizona. "Abby May loves to relax with her Hawaiian toys," writes char211. "Mahalo, everyone!"

Dudley, a Yorkshire terrier from Austin, Texas. "Dudley is the nicest bee around, but he is ready to sting (tongue in position, eyes squinting) if you take away any of his Halloween treats!" writes MarthaGarcia.

007, a quarter horse from Gilbert, South Carolina. "This photo is of our daughter," writes Freelancer. "Her Horse, 007, got all dressed up for the Heart Association Ride in Myrtle Beach, South Carolina, last October. We are going again. The ride is held every year. It is a 20-mile beach ride, and you camp with your horse! Fun!"

Lucy, a Lab from Oregon City, Oregon. "Lucy loves to dress up and model for photos, especially if she gets treats," writes trishmoore55.

Toto, a cairn terrier from Rowlett, Texas. "This is a shot of the lovely Toto modeling her new Halloween costume," writes jesseatte. "She is not ready for tricks, but definitely ready for treats!"

Willie, a boxer from San Tan Valley, Arizona. "Cowboy Willie enjoys his time down on the farm," writes zennla.

Coco Bean, a Mini Rex rabbit from Seattle. "Coco Bean is dressed as a spooky spider," writes riosamel. "Beware ... don't get caught in his web! Happy Halloween!"

Tatanka, a basset hound from Ada, Michigan. "Why is this little hat on my head?!" writes stormore.

Coco Chanel, a Pom-Chi from Wichita Falls, Texas. "Coco wearing her cute little Harajuku witch costume made by Ada Nieves," writes mel1981.

Chico, Bebe and Manny, Chihuahuas from Pennington, New Jersey. "At first glance, you might think this is a picture of some of the cast of MTV's 'The Jersey Shore,'" writes nikkdiss116. "But when you look closer, you see they are actually dogs! Chico, with his natural blowout is DJ Pauly D. Lil Bebe is Snooki, complete with a pouf. And Manny shows off his rock-hard abs as the Situation!"

Bella, a Landseer Newfoundland-Saint Bernard cross from Ottawa. "Bella is a very easygoing 11-month-old Newf-Saint," writes Planetchic. "She was such a good sport trying on costumes! Because of her natural eye patch and her water backgound, I thought a pirate would be suitable. Trick or Treat!"

Darci, a Pomeranian from Huntsville, Alabama. "Wishing you a Smurfy Halloween," writes DarciNelly. "The Smurfs were my all-time favorite cartoons growing up, and since they don't make a Smurfette Halloween costume for pups, I decided I was going to make it myself."

Blu, a Siamese mix from Wildwood, Florida. "Getting Blu ready for Halloween," writes eldt316. "He seems so interested."

Chico, a Chihuahua from Brooklyn. "Getting ready for Halloween, Chico came with me to pick out our pumpkin," writes StellaBlanca.

Gabrielle, Hercules, and Xena, Chihuahuas from Niagara Falls, New York. "Gabrielle is a little guard dog who would prefer staying at home protecting the house than going out," writes markelly. "Hercules is a little ham who loves to dress up and go out, especially on Halloween. Xena is Daddy's girl, who will do anything to please him. She is passive and loving. Combined, they make a wonderful family. I love my babies, and they love their Daddy!"

Breezy, a Long-Hair Chihuahua from Milwaukie, Oregon. "Breezy in her bumblebee costume seems to be saying to one and all, 'Buzz off!'" writes gilesk.

BamBam, a Jack Russell terrier from Leland, Michigan. "BamBam is Dorothy with her companion, Toto, in the basket!," writes jeepgirl6.

Laela, a Holland Lop rabbit from Michigan. "The toughest rabbit on the high seas! Laela enjoys nibbles of carrot booty, swigs of apple cider, and traversing the dangerous ocean waters of yore," writes Xanthum.

Bella, a Pomeranian from Louisville, Kentucky. "This is Bella at her Mardi Paws best," writes pommomky. "She is about 1 1/2 in this photo."

Rocco, a chinchilla from Sunnyvale, California. "Rocco is always ready to dress up for a party," writes meegus.