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.
- Constructed of quality foam
- Removable and washable cloth cover
- Two blocks may be used to lift up to 6"
- 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