K9 Booster Block

Sizing your dog for a K9 Sport Sack isn't an exact science. If your dog is in between sizes, has a wide body but short in length, or is still growing, the Booster Block fits snuggly in the bottom of your K9 Sport Sack to boost your dog up 3" It helps make the K9 Sport Sack experience more comfortable for you and your dog. FEATURES Constructed of quality foam Removable and washable cloth cover Two blocks may be used to lift up to 6" SIZING XS/S are interchangeable between XS and S sized backpacks M/L are interchangeable between M and L sized backpacks XL backpacks require an XL Booster Block XXL Bags require an XXL Booster Block