Size Guide

Dog Diaper Size Guide

Find your dog's perfect fit in minutes. Properly fitted diapers mean better comfort, zero leaks, and a happy pup. Use our guide to measure with confidence.

Happy dachshund wearing a Peekeeper diaper at home

Why Size Matters

Proper Fit Changes Everything

The right size means your dog stays comfortable, dry, and secure — so you can stop worrying and start enjoying your time together.

Better Comfort

A correctly fitted diaper won't pinch, rub, or restrict movement. Your dog can run, play, and sleep without irritation.

Leak Protection

A snug seal at the waist and proper length coverage prevent accidents from reaching your furniture, carpets, and bedding.

Secure Fit

No more slipping or twisting. The right size keeps the diaper securely in place so your dog stays clean and you stay stress-free.

How to Measure

Three Simple Steps

Grab a flexible tape measure — or use a string and a ruler — and follow these steps.

Measure Waist

Measure one inch in front of your dog's hind legs, all the way around the belly. Keep the tape snug but not tight — you should be able to slip two fingers underneath.

Measure Length

Measure from the base of the neck (where the collar sits) to the base of the tail. Make sure your dog is standing with their head held up, not sniffing the ground.

Compare Measurements

Match your dog's waist and length to the size chart below. If your measurements fall between two sizes, choose the larger size for a more comfortable fit.

Visual Guide

Where to Measure

Follow the guide below to identify exactly where to take each measurement.

Length

Waist

How to Measure

Waist

Measure one inch in front of your dog's hind legs, all the way around the widest part of the belly. Keep it snug — two fingers should fit underneath.

Length

Measure from the base of the neck (where the collar sits) to the base of the tail. Make sure your dog is standing with their head held up.

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Pro Tip

Don't have a flexible tape? Use a shoelace or string around the belly — mark where it meets and measure the string against a ruler for the same result.

Interactive Tool

Find Your Dog's Size

Enter your dog's measurements below and we'll recommend the perfect Peekeeper size.

Waist (inches) *

Measure around the widest part of the belly

Length (inches) *

Measure from neck base to tail base

Breed (optional)

Tip: For the most accurate result, measure your dog while standing and use a soft tape measure.

Reference Chart

Complete Size Chart

Use this table to find the right size based on your dog's measurements.

Swipe to view full table

Size	Waist	Available Lengths	Weight
XSExtra Small	9" — 12"	10" — 12"	Min 5 lbs
SMSmall	13" — 16"	12" — 16"	Varies
MEDMedium	17" — 21"	14" — 18"	Max 40 lbs

Tip:If your dog's measurements fall between two sizes, choose the larger size for a more comfortable fit.

Dachshund wearing a Peekeeper diaper — front view

Measurement Tips

Flexible TapeUse a soft measuring tape for best accuracy.

Dog Standing NaturallyMeasure with your pup in a relaxed, upright stance.

Accurate MeasurementSnug but not tight — two fingers should fit under the tape.

Breed Reference

Common Breed Examples

Quick reference for what size your breed typically needs. Individual measurements may vary.

Chihuahua

Avg weight: 4–6 lbs

Yorkshire Terrier

Avg weight: 4–7 lbs

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Pomeranian

Avg weight: 3–7 lbs

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Toy Poodle

Avg weight: 4–6 lbs

Maltese (Teeny)

Avg weight: 4–7 lbs

Pekingese

Avg weight: 7–14 lbs

Shih Tzu

Avg weight: 9–16 lbs

Dachshund (Mini)

Avg weight: 11–16 lbs

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Miniature Pinscher

Avg weight: 8–10 lbs

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Jack Russell Terrier

Avg weight: 13–17 lbs

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Beagle

Avg weight: 20–30 lbs

MED

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French Bulldog

Avg weight: 16–28 lbs

MED

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Cocker Spaniel

Avg weight: 20–30 lbs

MED

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Boston Terrier

Avg weight: 12–25 lbs

MED

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Corgi

Avg weight: 22–30 lbs

MED

Pug

Avg weight: 14–18 lbs

MED

FAQs

Sizing Questions?

Answers to the most common sizing questions from our customers.

Measure one inch in front of your dog's hind legs, not around the chest. Use a flexible tape measure or a string that you can lay flat against a ruler afterward.

If your dog's measurements fall between two sizes, we recommend choosing the larger size for a more comfortable fit. A slightly roomier diaper is better than one that is too tight.

Weight is provided as a general guideline only. Always use waist and length measurements for the most accurate fit, as dogs of the same weight can have very different body shapes.

The diaper should be snug but not tight. You should be able to fit two fingers between the diaper and your dog's body. The Velcro straps should overlap comfortably.

Yes. For dogs who are high leg lifters or who wet while lying down, we recommend using a belly band or disposable dog diaper underneath the Peekeeper for maximum protection.

Yes! Our diapers are 100% machine washable. We recommend washing in cold water and tumble drying on low. Avoid fabric softeners to maintain absorbency.

Still Unsure?

Need Help Choosing?

Every dog is unique. If you're unsure about sizing, our team is happy to help you find the perfect fit. Send us your dog's measurements and we'll personally recommend the right size.

Find Your Fit

Ready to Give Your Dog the Perfect Fit?

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Size

Waist

Available Lengths

Weight

XSExtra Small

9" — 12"

10" — 12"

Min 5 lbs

SMSmall

13" — 16"

12" — 16"

Varies

MEDMedium

17" — 21"

14" — 18"

Max 40 lbs