Dog Collar Sizing Guide | Find the Perfect Fit Every Time
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Dog Collar Size Guide: The Only Guide You Need to Get the Perfect Fit

  • By Chris Loverseed

Published: Friday, Jun 6, 2025

Finding the right collar size for your dog is more than just a comfort issue—it’s about safety, control, and peace of mind. In this guide, you’ll learn how to measure your dog correctly, including how to measure your dog's neck circumference, and select the right collar for their size, lifestyle, and personality.

To ensure a proper fit and your dog's safety, a properly fitted collar keeps your dog safe and comfortable. Too loose, and it can slip off. Too tight, and it causes discomfort or even injury. Always measure before you buy. After measuring your dog's neck, add about two fingers' width to the neck size to ensure comfort and safety.

Jump to section quickly:

  • How to Measure Your Dog’s Neck

  • Dog Collar Size Chart

  • Types of Dog Collars

  • What Is a Slip Collar?

  • Final Tips

  • Frequently Asked Questions


How to Measure Your Dog’s Neck

Use a soft measuring tape to measure your dog's neck circumference by wrapping it around the base of the neck where a collar naturally sits. It should be snug, but not tight. You should be able to fit two fingers between the tape and your dog’s neck.

For growing puppies, re-measure your puppy's neck every few weeks.


Dog Collar Size Chart

Breed of Dog Neck Size (cm) Neck Size (inches)
Afghan Hound 41-51cm 16-20"
Airedale Terrier 48-55cm 19-22"
Alaskan Malamute 46-56cm 18-22″
Australian Shepherd 41-56cm 16-22″
Australian Shepherd Miniature 25-36cm 10-14"
Basset Hound 42-51cm 17-20″
Beagle 41-46cm 16-18″
Bearded Collie 41-48cm 16-19"
Bedlington Terrier 35-45cm 14-18″
Bernese Mountain Dog 51-56cm 20-22"
Bichon Frise 35-46cm 14-18″
Bloodhound 59-71cm 22-28"
Border Collie 41-46cm 16-18"
Border Terrier 28-33cm 11-13″
Borzoi 46-56cm 18-22"
Boston Terrier 30-45cm 12-18″
Boxer 41-56cm 16-22″
British Bulldog 46-61cm 18-24"
Bullmastiff 66-71cm 26-28"
Cairn Terrier 37-42cm 14-16″
Cavalier King Charles Spaniel 25-36cm 10-14″
Cavachon 25-36cm 10-14"
Cavapoo 25-41cm 10-16"
Chihuahua 20-32cm 8-13"
Chinese Crested 20-28cm 8-11″
Chow Chow 50-65cm 20-26″
Cockapoo 25-41cm 10-16"
Cocker Spaniel 30-46cm 12-18″
Collie 46-56cm 18-22"
Corgi 36-41cm 14-16"
Dachshund (Standard) 30-41cm 12-16″
Dalmatian 41-50cm 16-20″
Doberman Pinscher 46-61cm 18-24″
English Bulldog 45-62cm 18-24″
English Bull Terrier 30-46cm 12-18"
English Setter 46-61cm 18-24″
Flat Coated Retriever 46-61cm 18-24
French Bulldog 30-41cm 12-16″
Fox Terrier 41-45cm 16-18"
German Shepherd 46-60cm 18-24"
German Short Haired Pointer 38-43cm 15-17″
Golden Retriever 45-53cm 18-21"
Goldendoodle 41-56cm 16-22"
Gordon Setter 46-61cm 18-24"
Great Dane 51-66cm 20-26″
Greyhound 46-50cm 18-20"
Havanese 20-30cm 8-12″
Irish Setter 41-45cm 16-18"
Irish Terrier 35-45cm 14-18"
Irish Wolfhound 55-65cm 22-26"
Italian Greyhound 20-28cm 8-11″
Jack Russell 25-36cm 10-14″
Japanese Akita 51-61cm 20-24"
Labradoodle 41-50cm 16-20"
Labradoodle Miniature 30-41cm 12-16″
Labrador 46-60cm 18-24"
Leonberger 51-66cm 20-26"
Lhasa Apso 35-45cm 14-18"
Lurcher 35-42cm 14-17"
Maltese Terrier 25-36cm 10-14″
Miniature Dachshund 20-34cm 8-13″
Miniature Goldendoodle 35-41cm 14-16″
Miniature Pinscher 20-28cm 8-11″
Miniature Poodle 25-41cm 10-16″
Miniature Schnauzer 25-41cm 10-16″
Newfoundland 66-81cm 26-32"
Old English Sheepdog 46-61cm 18-24"
Pomeranian 35-41cm 14-16"
Poodle 30-45cm 12-18″
Poodle (Toy) 20-36cm 8-14″
Pug 30-41cm 12-16″
Puggle (Pug/Beagle) 30-46cm 12-18"
Rhodesian Ridgeback 51-58cm 20-23"
Rottweiler 61-76cm 24-30"
Saluki 33-46cm 13-18"
Samoyed 41-51cm 16-20"
Schipperke 25-36cm 10-14"
Schnauzer (Standard) 36-51cm 14-20″
Scottish Terrier 35-45cm 14-18"
Shiba Inu 35-41cm 14-16"
Shih Tzu 35-42cm 14-16.5"
Shetland Sheepdog 28-46cm 11-18"
Siberian Husky 46-50cm 18-20"
Springer Spaniel 36-46cm 14-18″
Staffordshire Bull Terrier 45-60cm 18-24"
St Bernard 66-81cm 26-32"
Hungarian Vizsla 38-66cm 15-18"
Weimaraner 41-56cm 16-22″
Welsh Cardigan Corgi 35-40cm 14-16"
Welsh Pembroke Corgi 35-40cm 14-16"
West Highland Terrier 35-41cm 13-15″
Whippet 33-38cm 13-15″
Yorkshire Terrier 25-30cm 10-12"

 

Always check the product's specific size guide before purchasing.

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Types of Dog Collars

 

 

Leather Collars

Timeless, elegant, and built to last — genuine leather collars are a favourite for everyday wear. They’re durable, comfortable against your dog’s skin, and develop a beautiful patina over time. Perfect for dog owners who value both function and refined style.
Learn more about PK9 Leather collars

Leather Dog Collar - Premium latigo Leather - Handmade - PK9 Gear

Latigo Leather Dog Collar – Oily Series (Limited Edition)

Leather Dog Collar - Made With Premium Herman Oak Leather - PK9 Gear

Leather Dog Collar- Made With Premium Hermann Oak Leather


Biothane Collars

Biothane collars are a waterproof, low-maintenance alternative to leather. They offer the same sleek look but are more resistant to water, mud, and odors — making them ideal for outdoor adventures. Strong, flexible, and easy to clean.
Shop PK9 Biothane collection


Martingale Collars

Designed for dogs with narrow heads or those who often slip out of traditional collars, martingale collars gently tighten when your dog pulls but stop before becoming too tight. A trusted choice for sighthounds and escape artists.
Get Your Custom Leather Martingale Collar


Tactical Dog Collars

Ideal for strong, active dogs, including working breeds, K9s, or dogs who pull heavily on walks. Featuring reinforced stitching, solid metal hardware, and integrated handles, these collars are built for serious training or rugged environments.
Check out our tactical collar

Discover PK9 Collar Collection


What Is a Slip Collar?

A slip collar, sometimes called a training collar or slip lead, is a loop-style collar that tightens when your dog pulls and loosens when they stop. Unlike flat or martingale collars, a slip collar doesn’t have a fixed size—it tightens with tension and should only be used under supervision or for training purposes.

 

Important: When choosing a slip collar, you don’t measure your dog’s neck—you measure the widest part of their head, typically just in front of the ears. This ensures the collar can slide on and off comfortably while still tightening safely when needed.

Slip collars are popular with professional trainers and working dog handlers who want quick control without clips or buckles.
Learn more in our Slip Lead product page

Dog Training Obedience Slip Collar – Precision Control Collar

Dog Training Obedience Slip Collar – Precision Control Collar

Tab Slip Collar- Ultimate Control - PK9 Gear

Tab Slip Collar- Ultimate Control

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Final Tips

  • Re-check fit regularly, especially with growing dogs.
  • Adjust after grooming or weight changes.
  • When in doubt, size up and use adjustability to fine-tune.

If you're ready to place your order, we're here to help with any questions about sizing or the ordering process.

 

Need help choosing the right collar? 

 

Explore all PK9 dog collars for durable, purpose-built options that keep your dog safe and stylish.

Measure once. Check often. Choose quality.

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Frequently Asked Questions

Q: Should I size up or down if my dog is between sizes?
A: Size up. It’s better to adjust a slightly larger collar than risk one that’s too tight.
 

Q: Do different collar types fit differently?
A: Yes. Martingales, for example, should be looser when relaxed. Always follow product-specific guides.
 

Q: How often should I replace a collar?
A: Check monthly. Replace immediately if there are signs of damage.
 

Q: Is breed-specific sizing important?
A: Very. Different breeds have different neck shapes and sizes. Our breed chart can help you start in the right range.
 

Q: Can I use the same collar throughout my dog’s life?
A: Only if it still fits well and remains in good condition. Puppies, especially, will outgrow theirs quickly.

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