Being a wire-haired dog, shaving a Schnauzer's fur would cause it to lose its characteristic texture, giving its hair a fine, cotton-like appearance.
#14 Other tips for caring for a Schnauzer’s coat
Food is essential. It is recommended to give your dog a boiled egg yolk once a week.
During the summer, your dog shouldn't be exposed to the sun in the middle of the day, as this could dehydrate and dry out its coat.