DUO Eclipse PRO — Sizing, Fit & Adjustment
Everything you need to get a perfect fit on your Eclipse
Unboxing & getting started
First time with your Eclipse? Watch the unboxing video below.
DUO Essentials — Unboxing
For Essentials buyers — off the hang card
DUO PRO — Unboxing
For PRO buyers — premium packaging
Measure your dog
Same measurements across the DUO range. Measure torso first (the true fit), then confirm with neck and weight.
For giant breeds, size up if between sizes. The Eclipse has significant adjustment range. If unsure, use weight to decide.
PRO runs the same measurements in a heavier-duty build. PRO sizes start at SM — for dogs under ~20 lbs, choose Essentials XS.
Recommended for Adapt: escape artists, sighthounds, and narrow-headed dogs (Greyhounds, Whippets, Italian Greyhounds) — measure torso carefully, as long-bodied dogs often size up from their weight.
How to size adjust
Dial in the straps to your dog before the first walk or car ride.
Eclipse PRO size adjustment
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How to fit
Getting the Eclipse on and off, and the leash or car adapter attached.
Eclipse PRO fit guide
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Using the Eclipse in the car
The Eclipse connects to your car seat belt anchor via a standard adapter. One harness, two jobs.
Get a seat belt adapter
Any standard dog seat belt adapter works — the Eclipse back D-ring accepts standard carabiner-style clips. No proprietary adapter required.
Fit the harness as normal
Put the Eclipse on your dog the same way you would for a walk. Full fit and adjustment applies — the harness should be snug before clipping into the car.
Clip into the back D-ring
Run the seat belt adapter through your vehicle anchor point and clip into the Eclipse back D-ring. The buckle force rating ensures the connection holds in a sudden stop or impact.
Buckle force rating: 500–1,000 lbs. Standard harness buckles are rated at 200–400 lbs. For a large breed hitting the end of a tether at speed, the difference is not theoretical.
How to connect the Eclipse to your vehicle seat belt anchor
