Size Chart: 

Size	Neck (Inches)	Recommended Thickness	Approx. Weight  (Lbs)	Breed Examples
XSmall	Up to 11"	Collar: 1/2" Leash: 1/2"	Up to 20lbs	Yorkshire Terrier, Miniature Pinscher, Chihuahua
Small	11"-14"	Collar: 1/2" or 3/4" Leash: 1/2"	20 - 50lbs	Boston Terrier, Pug, Cocker Spaniel
Medium	14”-17"	Collar:  3/4" or 1"  Leash: 1/2" or 3/4"	50 - 70lbs	Corgi, Boxer, Border Collie, Poodle
Large	17"-20"	Collar:  1" or 1.5" Leash:  3/4"	70 - 100lbs	German Shepherd, Doberman, Retriever,  Staffordshire Bull Terrier
XLarge	20-23"	Collar:  1" - 1.5" Leash:  3/4"	100 - 130lbs	Great Dane, Cane Corso, Rottweiler
XXLarge	Over 23"	Collar:  1" - 1.5" Leash:  3/4"	Over 130lbs	Saint Bernard, Bernese Mountain Dog,  Bull Mastiff

 

*Measure neck to guarantee proper fit; instructions for measuring your dog's neck and/or current collar can be found below.

*Dog breeds are for illustration purposes only; they may or may not be the appropriate size for your dog.

 

Measuring: 

Dogs, like people, are all unique and come in a variety of sizes and shapes. Here are a few steps to ensure that appropriate measurements are gathered and that the perfect collar is created:

Measuring your Dogs Neck:

1. Measure a few inches behind his head and add an inch for extremely small dogs or two inches for medium and large dogs. (#1)
2. Make a snug but not too tight fit with a tape measure. (If you don't have a tape measure, use a piece of string and a firm ruler to measure the string.)

How to Measure Your Dogs Neck - Youtube Video

 

Measuring your Dogs Current Collar:  

1. Remove your dog's existing collar and lay it flat.
2. Take a measurement from the buckle's centre to the present sizing hole or adjustment.

 

Collar Fit:

1. You should be able to slide two fingers under a correctly fitting collar and your dog's neck when it's on his neck. If there is extra room, go down a size. The collar is too small if both fingers don't fit.

* If you're ordering a Martingale or a Slip collar, make sure you measure at point #2 in the image above as well to ensure the size you choose fits within the range of these two measures.

* If you're ordering a Dominant Dog Collar or ECollar Strap, make sure you measure at point #2 

Harness Sizing:

 

TOP DOG HARNESS SIZE GUIDE

	X Small	Small	Medium	Large
Thickness	½”	¾”	¾”	1”
Neck Measurement	8 - 12”	10 - 16”	14” - 20"	18" - 24"
Girth Measurement	12 - 18”	16 - 22”	18 - 28”	24 - 34”
Approx. Dog Weight	Up to 15lbs	15 - 30lbs	30 - 60lbs	60lbs - 90lbs