Dog Collar & Harness Size Guide

Neck circumference: Measure around the widest part of your dog’s lower neck. Leave enough space so you can easily slip two fingers between the collar/harness and your dog’s neck.
Chest circumference: Measure at the widest point of the chest, typically a hand’s width behind the front legs. Go once around, holding the tape measure snug but not tight. Allow two fingers of space to prevent chafing or constriction.

Individual variation: Dogs of the same breed can vary widely, and there are no standard collar/harness sizes across brands.
Measure to confirm: Use a soft tape measure for the most accurate neck and chest sizes.
If in doubt, size up: A harness or collar that’s too tight can be uncomfortable or unsafe.
Breed charts: While we strongly recommend measuring your pup for the best fit, we’ve added some common breeds to our size charts below for guidance if measuring isn’t possible (e.g., buying a gift).

Size (Strap width)	Neck circumference	Example breeds
S (2.5 cm)	23 – 30 cm	Chihuahua, Yorkshire Terrier, Maltese, Pomeranian
M (2.5 cm)	30 – 37 cm	Pug, French Bulldog, Boston Terrier, Cavalier King Charles Spaniel
L (3.2 cm)	37 – 46 cm	Cocker Spaniel, Australian Shepherd, Dalmatian, Border Collie
XL (3.8 cm)	46 – 53 cm	Golden Retriever, Labrador Retriever, Boxer, German Shepherd

* If your dog is in-between sizes, we recommend sizing down.

Size (Strap width)	Chest circumference	Example breeds
S (2.5 cm)	40 – 48 cm	Shih Tzu, Lhasa Apso, Havanese
M (2.5 cm)	49 – 58 cm	Pug, French Bulldog, Beagle, Cocker Spaniel, Cavalier King Charles Spaniel
L (3.2 cm)	59 – 66 cm	Basset Hound, Bearded Collie, Border Collie, Large Münsterländer
XL (3.8 cm)	67 – 75 cm	Australian Shepherd, Standard Schnauzer, Dalmatian, English Bulldog
XXL (3.8 cm)	75 – 85 cm	Golden Retriever, Labrador Retriever, Boxer, Siberian Husky, German Shepherd