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      If you find your dog is between sizes and still growing (perhaps you would like to opt for a bigger size backpack to last) or your dog's breed is short legged/long bodied then we can help. We stock a range of K9 booster blocks that add a 3" lift to the backpacks.

      Please contact us at or on our live chat between 7am and 8pm if you need any help with sizing or choosing a version and we'll be happy to help!

      How to Measure for a K9 Sport Sack Dog Carrier Backpack?
      You will need two measurements, girth (around the widest part of your dog's chest) and length (from the start of their collar to the base of their tail) as displayed in the diagram below. Please continue down the page for individual product guides and recommendations. 

      K9 Sport Sack Size Guide


      Breeds can vary in length and girth and aren't confined to certain sizes, therefore breeds shown in this guide are for example purposes only.

      Air 2 Sizes

      Air 2 Size Guide

      Plus 2 Sizes
      Plus 2 Size Guide

      Snuggler Sizes

      Length - Measure from dogs collar to the base of their tail.
      Girth - Measure the widest part of your dog's chest. 

       Length Girth Size Common Breeds
      10 - 17" / 23 - 43 cm Up to 27" / 69 cm XS/S Chihuahua, Pomeranian, Cavalier King Charles, Toy Poodle
      17-23" / 43-58 cm Up to 31" / 79 cm M/L Jack Russel Terrier, Lhasa Apso, Pug, Corgi, French Bulldog

      Designed to be used with the K9 Sport Sack Air, Plus 2 and Urban models therefore means these will fit the corresponding dog breeds and sizes supported by each backpack's sizing chart.
      The XS/S snuggler will fit the XS/S Air, Plus 2 and Urban models whilst the M/L snuggler will fit the M/L Air, Plus 2 and Urban models.

      Trainer Sizes
      K9 Sport Sack Trainer Size Guide

      Knavigate Sizes
      K9 Sport Sack Knavigate Size Guide

      Rover Sizes
      K9 Sport Sack Rover Size Guide

      Rover 2 Sizes
      K9 Sport Sack Rover 2 Size Guide