DUO Technical Gear
Sizing & Fit Guides
Find your size, then choose your harness model.
Measure your dog
Two measurements: base of neck + torso. These two numbers determine your size across all DUO harness models.
How to measure your dog for the perfect fit
Size in real life
One dog per size. All wearing DUO.
XS
15 lbs
Cute Mutt
SM
35 lbs
Formosan Mountain Dog
M
48 lbs
Small Golden Retriever
L
65 lbs
Malanois
XL
110 lbs
Newfie
XXL
135 lbs
Cane Corso
Choose your harness model
Each model has a dedicated sizing, fit & adjustment guide. Pick your harness.
DUO Direct
No-Pull Harness
For dogs that pull. The front-clip cinch mechanism reduces pulling without pressure on the throat.
Sizing & fit guide
DUO Adapt
No-Escape Harness
For dogs that escape. The cinch closes escape gaps as the dog backs out or reverses.
Sizing & fit guide
DUO Eclipse PRO
Adventure & Car Harness
For walks, hikes, and vehicle travel. Connects to standard seat belt adapters via the back D-ring.
Sizing & fit guide
