All dogs are unique! Sometimes they will fall between backpack sizes for your K9 Sport Sack®. If your dog is in between sizes, has a wide body but short in length, or is still growing, the Booster Block fits snugly in the bottom of your K9 Sport Sack to give your dog about a 3" boost 3" (7.62 cm)to make their ride more comfy.

FEATURES

• Constructed of sturdy, quality foam
• Removable, washable cloth cover
• Use two blocks for a 6" lift

CHOOSE THE RIGHT SIZE

• XS/S - 3" tall * 8" wide * 5" deep (7.62 cm * 20.32 cm * 12.7 cm)
• XS/S can be used with XS and SM backpacks
• M/L - 3" tall * 10" wide * 6" deep (7.62 cm * 25.4 cm * 15.24 cm)
• M/L can be used with M, L, XL and XXL backpacks