Size Guide

Collar Size Guide

Measure twice, buy once

When it comes time to get a new collar, take a few minutes to make sure you’re getting the right size and your dog will thank you!

Collars can stretch over time and sizing can vary by style and manufacturer, so even if your dog’s current collar fits and you know its size, it’s important to take a new measurement before buying a collar.

For a buckle collar, follow the measurement instructions below to measure your dog’s neck or current collar and then check our size chart to see what collar length will fit.

Martingale collars are sized differently than buckle collars, since they slide on over a dog’s head. If you plan to get a martingale collar, use the instructions and sizing chart at the bottom of this page instead.

Check your dog’s collar regularly for fit and wear.

Size guide - measuring your dog for a collar

Measuring your dog

If this is your dog’s first collar, if you need a collar in a different size, or if you have been using a martingale or slip collar, the best way to ensure a good fit is by measuring your dog directly.

Measure at the narrowest point of your dog’s neck, just as tight or loose as you would like the new collar to fit. The collar should be snug, without being so tight that it will cause discomfort or loose enough to slide over your dog’s head.

As a rule of thumb, a well-fitting collar should leave just enough room for you to slide two fingers between the collar and your dog’s neck.

Measuring your current collar

If you are satisfied with the fit of your dog’s current buckle collar, you can measure the collar itself to get a new collar that fits the same.

For a standard buckle collar (with holes like a belt), measure from the buckle’s center bar, where it connects to the collar, to the hole that you are currently using.

For a side-release buckle collar (with two ends that clip together), measure from the end of the female part of the buckle to the opposite end of the collar, excluding the male part of the buckle.

Collar size chart

Length Fit range Length Fit range
20 cm 15 cm to 14 cm 8" 6" to 8"
25 cm 14 cm to 25 cm 10" 8" to 10"
30 cm 25 cm to 30 cm 12" 10" to 12"
35 cm 27 cm to 35 cm 14" 11" to 14"
40 cm 33 cm to 40 cm 16" 13" to 16"
45 cm 30 cm to 45 cm 18" 14" to 18"
50 cm 40 cm to 50 cm 20" 16" to 20"
55 cm 45 cm to 55 cm 22" 18" to 22"
60 cm 50 cm to 60 cm 24" 20" to 24"
66 cm 55 cm to 66 cm 26" 22" to 26"
76 cm 65 cm to 76 cm 30" 26" to 30"
86 cm 76 cm to 86 cm 34" 30" to 34"

a tail we could wag collar size chart

Length Fit range Length Fit range
Extra Small 20 cm to 30 cm Extra Small 8" to 12"
Small 28 cm to 38 cm Small 11" to 15"
Medium 36 cm to 51 cm Medium 14" to 20"
Large 46 cm to 64 cm Large 18" to 25"
Extra Large 58 cm to 76 cm Extra Large 23" to 30"

How we measure our collars

Center-bar buckle collar

Size guide - standard buckle collar

Belt-style buckle collar

Size guide - cotton collar

Side-release buckle collar

side-release collar

G.I. and Tuff Stuff collars

Size guide - GI & Tuff Stuff collar

Martingale Collar Size Guide

Measuring your dog

When measuring your dog for a martingale collar, keep in mind that the collar will need to be able to slip over your dog’s head, since it doesn’t have a buckle.

First, measure the widest part of your dog’s head. Next, measure your dog’s neck as you would for a standard, buckle-style collar. Use the larger of the two measurements.

Size guide - measuring your dog for a martingale collar

Martingale collar size chart

Length Fit range Length Fit range
10" 5.5" to 10" 25 cm 14 cm to 25 cm
12" 7.5" to 12" 30 cm 19 cm to 30 cm
14" 10" to 14" 35 cm 25 cm to 35 cm
16" 12" to 16" 40 cm 30 cm to 40 cm
18" 12" to 18" 45 cm 30 cm to 45 cm
20" 14" to 20" 50 cm 35 cm to 50 cm
22" 16" to 22" 55 cm 40 cm to 55 cm
24" 18" to 24" 60 cm 45 cm to 60 cm
26" 20" to 26" 65 cm 50 cm to 65 cm

a tail we could wag martingale collar size chart

Length Fit range Length Fit range
Small 28 cm to 38 cm Small 11" to 15"
Medium 36 cm to 51 cm Medium 14" to 20"
Large 46 cm to 64 cm Large 18" to 25"
Extra Large 58 cm to 76 cm Extra Large 23" to 30"

a tail we could wag Belt Size Guide

  • Step 1: Wear the pants that you would like to wear the belt with. If you are wearing a belt, remove the belt before measuring.
  • Step 2: Thread a tailor’s tape or other flexible material, such as a string, that you can then measure against a yardstick, through your belt loops, as you would a belt.
  • Step 3: Use this measurement to determine the recommended size belt.

Important consideration

Because different styles of pants sit at different points on the waist, it is recommended that you wear the pants that you will be wearing the belt with for a proper fit.

a tail we could wag belt size chart

If your waist measures Choose belt size If your waist measures Choose belt size
30" to 32.5" 30" 82.5 cm to 76 cm 76 cm
32" to 34.5" 32" 87.5 cm to 81.5 cm 81.5 cm
34" to 36.5" 34" 93 cm to 86.5 cm 86.5 cm
36" to 38.5" 36" 98 cm to 91.5 cm 91.5 cm
38" to 40.5" 38" 103 cm to 96.5 cm 96.5 cm
40" to 42.5" 40" 108 cm to 101.5 cm 101.5 cm
42" to 44.5" 42" 113 cm to 107 cm 107 cm
44" to 46.5" 44" 118 cm to 112 cm 112 cm
46" to 48.5" 46" 123 cm to 117 cm 117 cm
48" to 50.5" 48" 128.5 cm to 122 cm 122 cm