WUFTREK GUIDE
Dog Harness & Collar Size Guide
Learn how to measure your dog correctly and check the model-specific size chart to choose a comfortable, stable and secure fit.
BEFORE YOU START
Four keys to getting a useful measurement
Accurate measurements help you avoid choosing by intuition, breed or weight alone—details that do not fully reflect each dog’s body shape.
Use a flexible tape
A sewing tape follows the body contour without creating false gaps.
Measure while standing
Your dog should stand naturally and relaxed, with weight distributed across all four paws.
Don’t pull tight
Rest the tape against the coat without compressing the neck or chest.
Check the model
Sizing can vary by design, so always use the chart for the exact model.
HARNESS SIZE CHARTS
Dog Harness Size Guide
Select the model you want to buy. Open its chart to view it full size on mobile or desktop.
Y-HARNESS
TrekFit Y-Series
Measure mainly around the chest and confirm that the result falls within the size range.
NO-PULL HARNESS
AirTrek Pro
Check the chest circumference and adjust every point without restricting movement.
H-HARNESS
TrekZero H-Series
Check both neck and chest measurements so the straps sit securely and away from the armpits.
ESCAPE-RESISTANT HARNESS
TrekFit Y-3
Measure the chest and make sure the third strap sits behind the rib cage without feeling tight.
PULLING HARNESS
CaniTrek
Use the model-specific measurements; a canicross harness must fit correctly while working under tension.
COLLAR SIZE CHARTS
Dog Collar Size Guide
Measure the neck where the collar will sit. Do not measure another collar because its total length may not equal the usable neck circumference.
AIRTAG COLLAR
TagTrek
Confirm the neck circumference and leave enough room for two fingers without making the collar loose.
WIDE COLLAR
MaxTrek Find
Use the actual neck measurement to choose a size and check the fit before using the control handle.
LIGHTWEIGHT COLLAR
TrekLite
Measure the neck circumference and confirm the collar cannot slip over the dog’s head.
WATER & MUD
Biothane® Collar
Measure directly around the neck and avoid leaving excessive slack.
LEARN STEP BY STEP
Videos: How to Take Measurements Correctly
See where to place the tape and measure your dog while standing, relaxed and without compressing the coat.
HARNESS
How to take the main measurement
Learn where to place the tape before choosing a WUFTREK harness size.
3-ADJUSTMENT HARNESS
How to take all three measurements
Review the measurement points needed for a design with three adjustment zones.
COLLARS
How to measure the neck
Measure the actual neck circumference and check the fit before choosing a size.
STEP BY STEP
How to Measure Your Dog
Take each measurement twice and write the result in centimeters before checking the product chart.
FOR HARNESSES
Chest circumference and base of neck
- Wrap the tape around the widest part of the chest, usually just behind the front legs.
- Measure the base of the neck where the front of the harness will sit.
- Compare both measurements with the chart for the exact model.
FOR COLLARS
Actual neck circumference
- Wrap the tape around the area where the collar normally sits.
- Keep the tape level and do not compress the coat.
- After fitting the collar, confirm that two fingers fit comfortably underneath.
FREQUENTLY ASKED QUESTIONS
Questions before choosing a size
Quick answers for measuring correctly and checking the fit of your dog’s gear.
Can I choose a size using only weight or breed?
No. Weight and breed can be useful references, but dogs of the same breed can have different proportions. Use your dog’s actual measurements and the chart for the exact model.
How do I measure my dog for a harness?
Measure around the widest part of the chest and, when the chart requires it, the base of the neck. Your dog should be standing and the tape should rest against the coat without tightening.
How do I measure the neck for a collar?
Wrap a flexible tape around the area where the collar will sit. Do not measure another collar or compress the coat. After fitting the collar, two fingers should fit between it and the neck.
Are sizes the same across all WUFTREK models?
Not necessarily. Each design has its own structure and adjustment range. Always check the chart for the exact model you want to buy.
What should I do if the measurement falls between two sizes?
Compare the adjustment ranges and model instructions. Do not automatically choose the larger size; anatomy and correct strap position also matter.
Should I measure over the coat?
Yes. Measure your dog as the gear will normally be worn, without compressing the coat or leaving the tape too loose. For long-haired dogs, check the fit again after putting the product on.
How snug should a harness or collar be?
It should stay stable without restricting breathing or movement. Two fingers are a useful general reference, but also make sure the product does not rotate, rub or allow the dog to back out.
When should I measure my dog again?
Measure again if your dog is growing, changes weight, has a major coat change or you are buying a different model. Also check the fit of existing gear periodically.
CHOOSE USING THE RIGHT MEASUREMENTS
Find the right gear for your dog
Compare each model’s adjustment range and choose according to your dog’s anatomy and activity.