Puppy Flat Chest protector & treatment "bundle"All SizesA cast created to help treat flat chest. Flat chestedness (and other chest deformities) are extremely dangerous conditions in which a puppy will be born with or develop a flat chest due to environmental, congenital, or genetic (Pectus Excavatum) factors. Sometimes you can take all the precautions to prevent a flat chest from occurring and it still ends up happening! Luckily, there is a solution. Our kits come with 6 casts that your puppy can grow