Why we do not shave breeds like these
Shaving breeds like this can cause Alopecia. Hair loss (alopecia) is a common disorder in dogs which causes the animal to have partial or complete hair loss. It can affect a dog's skin, its endocrine system, its lymphatic system, and its immune systems. Alopecia can affect dogs and cats of all ages, breed and gender, and is either gradual or acute.
Any breed that sheds can be subject to alopecia if clipped in any way.
It doesn’t really matter if it is a longer blade or short. Clippering these breeds removes the top coat which is the guard hair that does not shed and leaves you with the fuzzy undercoat. Over time your dog may end up looking like any of the above photos.