Schnauzers will have hair growth in the first 7 months after birth, and it is the period of hair growth in dogs until 10 months. Some Schnauzers have not had hair growth in the 8th month. This is It is a manifestation of lack of nutrition in the body. After the owner finds out, he should strengthen his diet and feed more foods containing protein, vitamins and calcium. Groom your dog's hair frequently to promote hair growth.