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
I got the small size of the air2 pack but it is a little big for my toy poodle. put this booster in and works great. so now I can use the pack for either dog, my toy poodle or my 17lbs schnoodle.
My toy poodle has congestive heart failure. He cannot enjoy exercise and cannot go up the stairs. I bought the K-9 sport specially for the stairs. It has worked out really well and we don’t just use it for the stairs. I’ll give it seven stars.
K9 Sports Sack
My Max goes with me everywhere.
Great that they have this to accommodate different pup shapes! Now my maltese can properly fit in the xsmall pack!
Just a little boost
Our Corgi girl Sachi is a little thing and was a bit short for the sport sack that we purchased. The booster block gave her just enough height so that her little arms didnt fall through. She is a happy little rider.