for orders over £49


all around the world


within 60 days


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Description & Size guide

The Ruffwear Cooler offers a simple and effective cooling solution for your dog. Designed naturally keep dogs cool and comfortable. Ideal for use during hot days, or during physical activities - It may even allow them to be active for longer!

When we think about how hot and uncomfortable we can get in the summer heat or during exercise, then just think about how your dog must feel… especially those with thicker coats!

Ruffwear’s Core Cooler Add-On is a great way to ensure your dog is kept cool, allowing them to still join you in your daily activities. Specially designed to cool your dogs chest and stomach area, helping to reduce your dogs core temperature.

This is a simple add on to the Ruffwear packs and harnesses, featuring a comfortable Velcro fastener, that won’t affect your dogs movements. Which also makes this quick and easy to fit, causing minimal disruption to your daily routine.

How It Works

All you need to do is soak the Ruffwear Core Cooler in cold water, then ring it out and fasten around your dog – And you’re ready to go!
Ruffwear’s dog cooler uses a high-tech three layer system. Designed to help keep your dog comfortable and cool during hot weather and great for use during exercise.

Read more about: Do dog cooling products actually work?


  • Reduces the likelihood of over heating
  • May prolong energy levels
  • Keep your dog cool in the heat
  • Ideal for use during physical activities
  • Easy & quick to fit
  • Comfortable to wear

Providing you with an effective chest cooler, perfect to keep your dog cool during hot weather. Helping to prolong energy levels and reduce the risk of your dog overheating during exercise.

The Ruffwear Core Cooler is ideal for activities such as hiking, back packing, for use during hot weather and is great for working dogs too.

(The Ruffwear Core Cooler has been designed to be combined with a variety of harnesses, including Ruffwear’s Web Master, Web Master Pro, Approach, Palisades and the Singletrak backpacks)




Approach™ Pack, Palisades™ Pack, Singletrak™ Pack,

Web Master™ Harness, Web Master Pro™ Harness

X-Small = Harness/Pack X-Small
Small = Harness/Pack Small
Medium = Harness/Pack Medium
Large / X-Large = Harness/Pack Large/X-Large
Delivery & Returns


FREE STANDARD DELIVERY on orders over £49

Delivery is free via Royal Mail Tracked service and will take 3-5 working days* to arrive with you.

BASIC DELIVERY on orders under £25

Delivery is £3.35 via Royal Mail 48 service and will take 3-7 working days* to arrive with you.

STANDARD DELIVERY on orders up to £48.99

Delivery is £4.20 via Royal Mail Tracked 48 service and will take 3-5 working days* to arrive with you.


Delivery is £6.30 via Royal Mail Tracked 24 service and will take 1-3 working days* to arrive with you.

SPECIAL DELIVERY (Guaranteed Next Working Day)

Delivery is £8.99 via Royal Mail Special Delivery. This is a guaranteed next working day service and orders must be placed before 3pm. orders placed on a Friday will be delivered the following Monday. Orders placed after 3pm on Friday will be delivered the following Tuesday. This service may not be available in all location i.e. BFPO or Highlands & Islands.

*Delivery times are estimated from shipment and subject to stock availability. Our cut off time for orders is 3pm. Working Days are Monday to Friday and don't include UK public holidays.


At we operate a fair postage policy and we have no additional charges for deliveries to BFPO addresses or the Highlands & Islands.


Delivery to EU from £10.99 (Royal Mail Tracked And/Or Signed)
Free Delivery to EU on orders over £150

International Delivery (Outside EU):
International Delivery £11.99 (Royal Mail Tracked And/Or Signed)
Free International Delivery on orders over £200


We operate a 60 day returns policy at K9active. Items can be returned within 60 days of the shipment date.

For orders placed in the UK we provide free returns potage for exchange items. UK Only orders requesting a refund you can use our returns label, the cost of which £3.50 (Royal Mail Tracked return service) will be deducted from your refund. Alternatively you can use a courier of your choice.


Delivery for some products mainly Large items and Dog Beds will incur shipping charges in addition to our regular postage rates above. In most cases these products will be sent directly from the manufacturers warehouse on a next day courier. In all cases that there will be additional costs for a product to be shipped you will be advised on the product page and you can see the exact cost for your order in the cart using the shipping estimator.

For information about returns, please click here to view our Returns Policy.

Core Cooler by Ruffwear

Size Guide