Yes, Shih Tzus are double coated. Double-coated breeds have a top coat of hair that has longer, coarse fur and an undercoat of softer, short, and dense hair. Each coat serves its purpose. The top coat protects dogs from water and snow, while the undercoat helps to insulate them from cold weather and regulate heat in higher temps. Shih Tzus aren't major shedders, but to keep their coats healthy, you might want to invest in two types of brushes - a top-coat brush and another one that can remove fur from the bottom undercoat.