Best Mermaid Dog Costumes to Buy in October 2025
1 
Mermaid Dog Halloween Costumes, Dog Clothes Mermaid Costume for Small Medium Dogs Cats Puppy, Cute Pet Cosplay Outfit for Christmas, Birthday Party Photo Props Dress up Accessories Parade
- TRANSFORM YOUR DOG: OUTFIT YOUR PUP IN A DAZZLING MERMAID COSTUME!
- EASY ADJUSTMENTS: TWO ADJUSTABLE STRAPS FOR A PERFECT FIT EVERY TIME.
- PERFECT FOR EVENTS: IDEAL FOR HALLOWEEN, PARTIES, AND FUN PHOTO OPS!
BUY & SAVE 
2 $9.99
cyeollo Dog Costume Mermaid Costumes for Small Dogs Halloween Outfit Holiday Birthday Party Dog Clothes Outfits Sparkly Pet Costumes Size M
- ADJUSTABLE DESIGN ENSURES A PERFECT FIT FOR ANY DOG SIZE.
- BRIGHT, COLORFUL COSTUME MAKES YOUR PET THE STAR OF HALLOWEEN!
- SOFT, COZY MATERIAL KEEPS DOGS WARM AND COMFY ALL DAY LONG.
BUY & SAVE
3 $27.99
Mermaid Dog Halloween Costume for Small & Medium Dogs - Sparkly Pet Costume with Funny Puppy Cosplay Clothes for Special Events
-
VIBRANT MERMAID TAIL: SHIMMERING DESIGN ENSURES YOUR PUP STEALS THE SHOW!
-
ADJUSTABLE FIT: COMFORTABLE FOR ALL SMALL TO MEDIUM DOGS WITH EASY STRAPS.
-
PLAYFUL SEASHELLS: ADORABLE DETAILS FOR A FUN UNDERSEA ADVENTURE VIBE!
BUY & SAVE
4 $9.99 $11.99
Save 17%
Ariel The Little Mermaid Dog & Cat Costume (X-Large)
BUY & SAVE
5 $29.41
Yoochee Dog Mermaid Costume, Dog Halloween Costume with LED Lights, Funny Halloween Thanksgiving Costumes, Sparkling Pet Costumes Cosplay Party Costumes for Small Pets Size S
- SPOOKY GLOW & SAFETY: LED LIGHTS KEEP DOGS VISIBLE AND STYLISH ON HALLOWEEN.
- COMFORT FIRST: SOFT, BREATHABLE FABRIC ENSURES YOUR PUP FEELS GREAT ALL NIGHT.
- EASY FIT & FUN: ADJUSTABLE DESIGN MAKES DRESSING UP QUICK AND HASSLE-FREE.
BUY & SAVE
6 $9.99 $12.99
Save 23%
Rubies Disney Little Mermaid: Flounder Pet Costume for For Dogs or Cats, Small
- AUTHENTIC DISNEY QUALITY: LOOK FOR TRADEMARKS FOR GENUINE COSTUMES.
- COZY & COMFORTABLE FIT: EASY ON, EASY OFF DESIGN FOR YOUR PET'S COMFORT.
- PERFECT SIZE MATTERS: FOLLOW OUR SIZE CHART FOR THE BEST FIT!
BUY & SAVE
7 $30.98 $32.99
Save 6%
Cat Mermaid Costume Creative Cat and Dog Costumes Funny Fishtail Dress Puppy Mermaid Fishtail Dress Pet Mermaid Costume Humor Funny Photo Props (Pink)
- TRANSFORM PETS INTO MERMAID PRINCESSES WITH STYLISH COSTUMES!
- SOFT, BREATHABLE MATERIAL ENSURES COMFORT FOR ALL-DAY WEAR.
- EASY ON/OFF DESIGN FOR HASSLE-FREE DRESSING AND JOYFUL MOMENTS!
BUY & SAVE
8 $9.99
Disney for Pets Halloween Princess Ariel Dog Costume - Officially Licensed Halloween Costumes for Dogs, Size Small
- OFFICIAL DISNEY DESIGN: DRESS YOUR PUP IN BELOVED DISNEY MAGIC!
- COMFORTABLE & WASHABLE: EASY TO CLEAN AND COMFY FOR ALL-DAY WEAR.
- PERFECT FOR HALLOWEEN FUN: IDEAL FOR PARTIES, TRICK-OR-TREATING, AND WALKS!
BUY & SAVE
9 $17.39
FLAdorepet Dog Princess Dress Costume with Rhinestones Crown,Pet Cat Cape Cloak Birthday Party Wedding Dress Up Outfits,Rainbow Mermaid Halloween Costume Clothes,Small
- SPARKLING MERMAID CAPE WITH FLASHING LIGHTS FOR FESTIVE FLAIR!
- DURABLE LUXURY CROWN ENSURES STYLE AND STABILITY FOR YOUR PET.
- SOFT, COMFY FABRIC KEEPS PETS HAPPY DURING ANY DRESS-UP EVENT!
BUY & SAVE
$17.90
+
ONE MORE?
A Mermaid Dog Costume is a costume designed for dogs that is inspired by mermaids. It typically consists of a tail fin, a seashell bikini or top, and sometimes even a headpiece or crown. These costumes often come in various sizes and are made from materials that are comfortable for dogs to wear. Mermaid dog costumes are popular for Halloween or other costume events where owners dress up their pets in fun and creative outfits.
How to Create a Mermaid Dog Costume
Creating a mermaid dog costume can be a fun project to engage in. Here's a step-by-step guide on how to make one:
Materials:
- Two colors of felt fabric (e.g., turquoise and purple)
- Scissors
- Fabric glue
- Velcro
- Sequins or beads (optional)
- Elastic cord or ribbon
- Tape measure
Steps:
- Measure your dog's back: Start by measuring the length of your dog's back from the base of their neck to the base of their tail.
- Cut the felt fabric: Use the measurements obtained in step 1 to cut out two pieces of felt fabric – one from each color. Make sure the pieces are long enough to cover your dog's back entirely and wide enough to wrap around their body.
- Create the mermaid tail: Take one of the fabric pieces and fold it in half lengthwise. Use scissors to cut a curved shape to create the mermaid tail. The top of the tail should be wider, and it should gradually become narrower towards the end.
- Attach the tail: Apply fabric glue along the non-folded edges of the fabric piece you just cut. Press the glued edges onto the corresponding sides of the other fabric piece and let the glue dry.
- Decorate the tail (optional): If desired, you can add sequins or beads to the tail to make it more sparkly and mermaid-like. Apply fabric glue to the area you want to decorate, then carefully press the sequins or beads onto it. Allow the glue to dry completely.
- Create harness straps: Measure the circumference of your dog's body by placing a tape measure under their belly, behind their front legs. Cut two wide strips of felt fabric, ensuring they are long enough to wrap around your dog's body and overlap slightly.
- Attach the straps: Apply fabric glue to the ends of the felt fabric strips and attach them to the sides of the mermaid tail, just below the top edge. Leave a small gap on each side for attaching the Velcro later. Make sure the straps are positioned in a way that comfortably wraps around your dog's body without causing any discomfort.
- Allow the glue to dry: Give the fabric glue enough time to dry completely before moving on to the next step.
- Attach the Velcro: Cut small pieces of Velcro and attach them to the gaps left on each side of the straps. This will allow you to secure the costume comfortably around your dog's body.
- Add fin details: Cut out fin shapes from the remaining felt fabric and glue them to the end of the tail. This will give the tail a more distinct aquatic look.
- Add elastic cord or ribbon: Cut two pieces of elastic cord or ribbon – each long enough to wrap around your dog's back legs comfortably. Attach one end of each piece to the bottom of the mermaid tail on each side. This will help keep the costume in place during movement.
Once the costume is complete, carefully dress your dog in it by fastening the Velcro straps around their body. Make sure it fits comfortably and doesn't restrict their movement or breathing. Always supervise your dog when they are wearing a costume to ensure their safety.
Where to Buy Dog Costumes
