My Shih Tzu is a little bigger than any Shih Tzu I know. He wears size M and can go to L if he is not groomed for a couple of months. The size that is here is M. Pattern can be easily adjusted to a needed size. It is very easy to make and anyone can do it.
Sizes: XS, S, M
Hook US 5 (H)
100g Bernat Pound of Love
You can use any leftover yarn you have in the house
Length of the sweater 10”-14”-16”
Chest Diameter 11”-18”-20”
Neck diameter 11” - 18”- 20”
15 stitches and 10 rows = 4 inches in hdc (half double crochet) with hook # 6