Size Guide
Clear guidance to help you measure your dog and choose the right fit.
Start With the Right Product
Sizing depends on the product you choose. Before taking measurements, make sure you know which type of gear you are ordering, such as a collar, harness, or harness link.
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Each product requires different measurements. This page explains exactly what is needed for each one.
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If you are unsure which product is right for your dog, we recommend reviewing finished examples first or visiting the How It Works page.
Collar Measurements
Collars require one measurement.
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What to Measure
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Neck size
Measure snugly around the base of your dog’s neck where the collar will sit. Do not add extra length. We build in appropriate adjustment.
This applies to all collar styles, including standard buckle, dual buckle, and martingale collars.
Model Y Step In Harness
The Model Y harness requires two measurements.
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What to Measure
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Chest
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Girth
The chest measurement is taken across the front of your dog’s chest. The girth measurement is taken around the widest part of the ribcage.
These measurements ensure the harness sits securely without restricting movement.
Model H Harness and HarnessLink
These products require four measurements.
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What to Measure
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Neck
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Girth
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Back length
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Under belly length
Each measurement is used to build a harness that distributes pressure evenly and fits your dog’s body properly.
Measurement instructions are specific and should be followed carefully.
Leashes and Hands Free Systems
No Measurements Required.
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Leashes and hands free systems do not require measurements.
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They are fully adjustable and designed to work across a wide range of sizes.
Choosing the Right Width
Biothane width is selected based on your dog’s size, strength, and the product you choose.
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Smaller widths are lighter and ideal for small dogs. Wider straps provide added strength and structure for larger dogs.
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Hardware is always sized to match the selected width for safety and balance.
We Can Guide You
If you are unsure about measurements, width selection, or which product is right for your dog, you can always reach out before placing an order.
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We are happy to review your measurements or answer questions so you feel confident moving forward.