What is the easiest Monsters, Inc. pet costume to DIY?

Mike Wazowski is the easiest. You only need a bright green dog t-shirt, felt sheets (white, blue, black), and fabric glue to assemble his giant eye on the back of the shirt.

How do I make sure the costume fits my dog safely?

Always measure your pet's chest girth and neck. Ensure the costume is not too tight around the throat and does not drag on the ground, which could cause tripping.

Can cats wear these Monsters, Inc. costumes?

Yes, but cats generally prefer lightweight capes or simple collars. A small Mike Wazowski collar attachment or a lightweight Boo hat is usually better tolerated than a full plush suit.

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Monsters, Inc. Pet Costumes

Turn your furry friend into Monstropolis's finest scarer or cutest toddler.

Monsters, Inc. pet costumes are a wildly popular choice for Disney fans who want to include their dogs or cats in Halloween festivities. Whether you want to dress your pet as the one-eyed Mike Wazowski, the fluffy blue Sulley, or little Boo in her purple monster suit, these looks are instantly recognizable and adorable. This guide covers how to choose, buy, or DIY the perfect monster outfit for your pet.

Difficulty: Easy
Time: ~15 min
Budget: $15–50

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40 Monsters, Inc. Pet costume ideas

Ranked by how many people are searching for them this season. Open any one for the full guide and to try it on.

What you need for a Monsters, Inc. Pet Costumes costume

Mike Wazowski Pet Bodysuit
A bright lime green step-in shirt or hoodie featuring Mike's giant single eye and happy grin printed on the back.
DIY: Use a plain green dog t-shirt and fabric paint to draw Mike's large white and blue eye and smiling mouth on the back.
Amazon
Sulley Plush Costume
A soft, textured turquoise blue faux-fur vest or hoodie detailed with purple spots and soft fabric horns on the hood.
DIY: Attach purple felt circles onto a blue dog hoodie, and sew two small stuffed grey felt horns onto the hood.
Amazon
Boo Monster Suit
A purple textured minky fabric body piece with silver fabric scale patterns, mop-like yarn hair, and googly eyes on top.
DIY: Craft a purple fabric vest, attach white yarn to a headpiece for the mop hair, and glue two foam balls on pipe cleaners for the eyes.
Amazon
Comfortable Chest Harness
A lightweight, breathable harness to wear underneath the costume for leash attachment.
Amazon

How to put it together

1
Select your character concept based on your pet's size, coat color, and comfort level with clothing.
2
Measure your pet's chest girth, neck circumference, and back length to ensure a proper fit.
3
Gently introduce the costume to your pet, letting them sniff the fabric before putting it on.
4
Slip your pet's front legs through the armholes of the vest or hoodie, securing any hook-and-loop fasteners loosely.
5
Position the hood or headpiece gently over their head, ensuring their ears are free and unobstructed.
6
Adjust the outfit so it does not restrict their movement, bathroom breaks, or vision.
7
Reward your pet with treats to associate the costume with a positive experience.

Monsters, Inc. Pet Costumes for couples, groups, kids & more

couples: Pair a Mike Wazowski dog with a Sulley dog for the ultimate scare-team duo.
group: Dress up as Boo or Celia Mae yourself to accompany your pet Mike or Sulley.

Tips

Never leave your pet unattended while they are wearing a costume.
If your pet dislikes hoods, look for costumes where the character's face is printed on the back of a shirt instead.
Take photos early in the evening before your pet gets tired or tries to wiggle out of the outfit.
Ensure the costume has a built-in leash portal or fits comfortably over their regular harness.

Monsters, Inc. Pet Costumes costume FAQ

What is the easiest Monsters, Inc. pet costume to DIY?: Mike Wazowski is the easiest. You only need a bright green dog t-shirt, felt sheets (white, blue, black), and fabric glue to assemble his giant eye on the back of the shirt.
How do I make sure the costume fits my dog safely?: Always measure your pet's chest girth and neck. Ensure the costume is not too tight around the throat and does not drag on the ground, which could cause tripping.
Can cats wear these Monsters, Inc. costumes?: Yes, but cats generally prefer lightweight capes or simple collars. A small Mike Wazowski collar attachment or a lightweight Boo hat is usually better tolerated than a full plush suit.

Did you know? In the original concept art for Monsters, Inc., Sulley was going to have tentacles instead of legs, which would have made pet costumes much more complicated to design!