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The Flagline Harness is a fast, light, and comfortable harness that keeps dogs in their flow, from scrambling in the backcountry to conquering everyday obstacles. A handle and load-dispersing chest/belly panel make for easy lift-and-assist in a nimble design good for all-day wear. High adjustability and easy on/off make the Flagline secure and accessible, giving dogs a little boost and a lot of freedom when the path ahead is anything but flat.

Learn how to properly fit and adjust the Ruffwear Flagline Harness 

Select Size

Measurement is around the widest part of the rib cage. If you need more help with sizing view our Sizing Chart.

In between sizes? Choose the larger size.

13-17 in (33-43 cm)
17-22 in (43-56 cm)
22-27 in (56-69 cm)
27-32 in (69-81 cm)
32-42 in (81-107 cm)
32-42 in (81-107 cm)
Select Size

In between sizes? Choose the larger size.

How To Measure

Key Features

Additional Features

  • Lightweight, easy on/off construction
  • Balanced and comfortable lifting with padded handle and load-dispersing chest/belly panel
  • Six points of adjustment for an optimal fit
  • Three leash attachment points: aluminum V-ring and two reinforced webbing loops
  • Debris-resistant liner
  • Reflective trim for visibility in low-light conditions and light loop for attaching The Beacon™


  • 420 denier nylon ripstop
  • 75 denier polyester lining with heat emboss
  • Nylon webbing
  • ITW Nexus Mach buckles
  • Anodized 6061-T6 aluminum V-ring
  • Made in Vietnam


  • Hand wash
  • Mild detergent
  • Air dry

Trail Tested Promise

All of our products are rigorously field tested and we proudly guarantee against defects in materials and craftsmanship.

Great Companions

Ratings & Reviews

Customer Reviews
4.5 Based on 70 Reviews
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Erik G.
United States United States
  • Dog's Name Buster & Junha
What else would we trust on the Colorado Trail this Summer

We don’t like this item we Love it. There is no other harness i would trust the lives of my pups with this summer on the. Colorado Trail

Erik Gerner verified customer review of Flagline™ Harness
Elizabeth A.
United States United States
  • Dog's Name Shamus
Pup approved

Love this harness. My pup is a Houdini and could get out of all the others we tried. The 2nd belly strap seems to work! It's cute. Its functional. Appears to be comfortable for my puppy. Easy to get on & off.

William C.
United States United States
  • Dog's Name Scout
Flagline harness helps an older dog

Our 13 year old Golden has a lot of front and rear leg arthritis and so trouble getting up. The Flagline harness helps us give him the small "power assist" that makes it easier for him to move around.

Kristen P.
United States United States
  • Dog's Name Mochi
Great Harness for my Shiba escape artisit!

The Flagline harness fit my Shiba great. And she has not been able to back out of it. I debated between this and the Webmaster, but after contacting Ruffwear for more information opted for this one. The information on proper fit is really helpful once you get it on your pup. We are still working on her being more comfortable getting the new harness on when she wants to got out, but that seems to be more of a Shiba thing than the harness itself. as there was only one harness she has had that she easily slipped on thus far. The security in knowing that she can't get out is worth it. Thanks Ruffwear!

Venetia H.
United States United States
  • Dog's Name Sasha. 17 years old.
Great help for old dog

Dog adapted to it v well

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