The Ruffwear Core Cooler™ is an add-on that cools dogs, adds additional support when lifting and assisting, and further stabilizes packs and harnesses. This three-layer chest panel uses evaporative cooling to efficiently pull heat from the dog’s core during warm temperatures and high intensity activities. To activate, wet the Core Cooler with water and wring out. The Core Cooler easily attaches to Ruffwear harnesses and packs using hook-and-loop sleeves:

Select Size

Use this fit guide to select the appropriate size for your dog. Measurement is around the widest part of the rib cage.

17-22 in (43-56 cm)
22-27 in (56-69 cm)
27-32 in (69-81 cm)
32-42 in (81-107 cm)

Key Features

Additional Features

  • Provides load dispersion and stability
  • Made in Vietnam

Washing Instructions

  • Secure fasteners
  • 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

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Zoe + Cria


We have one of these for both of our dogs and in general I am a big fan of it. One wears it underneath the approach pack, the other wears under the webmaster harness, and it works perfectly with each of these. Our Aussies are prone to overheating so having a cooling vest that you can combine with hiking wear is awesome! The ONE downside is that it only works for about 2, maybe 3 hours at best before needing to be rehydrated. I'm trying to work out a way to do this mid-hike but it's problematic because it needs to be either submerged or absolutely drenched in water. So while the benefits of having this on outweigh the lack of any cooling device at all, you still need to be careful of dogs overheating on longer hikes unless you can replenish it.

A Ruffwear Customer


I have the web master harness and I use it to help give my 3 legged pup a boost up without jostling his stump where his leg was amputated and his pelvis. I added this core cooler for padding for when I lift him so the straps of the harness don't dig into him, and the fact it cools him down is a huge bonus. For any dog using a harness and is active, I definitely recommend this core cooler. It is easy to use, stays clean and fits perfectly to the harness so it is comfortable for the dog.


Love it!

Tested this out with the Palisades pack this weekend. It fits well on the harness and didn't seem to bother my dog at all. So glad there's a cooling product she can comfortably wear with the harness and backpack on!