Shih Tzu Size. Shih tzu are classified in the toy group in most countries, with a height of eight to 11 inches and weight of nine to 16 pounds (four to seven kilograms). Many things contribute to the adult size of a shih tzu including health, activity and nutrition.
As with most toy breeds, shih tzu are quick to mature, reaching adult size by about 10 months. What size is a shih tzu? They usually weigh around 7 to 20 pounds 3 to 9 kg and have a height of 8 to 15 inches 20 to 38 cm at the shoulder.