Shih Tzu harness size chart: 14–20 in chest

How do I measure a Shih Tzu for a harness?

1. Stand the dog square. Use a soft tape around the deepest part of the ribcage, just behind the front legs.
2. Keep the tape level and snug, then leave room for two fingers under the chest strap.
3. Do not use neck circumference for the chest band. Neck and girth are different numbers.
4. Pick the smallest chart size whose maximum girth still covers your tape plus about one inch of ease.

What harness fit notes matter for a Shih Tzu?

A harness for a Shih Tzu is sized from chest girth, not from neck circumference. Typical adult chests sit around 14–20 inches at the deepest rib, behind the front legs. Leave about 1 inch of ease so two fingers fit under the strap.

At the low end of that range, expect the extra small band (12–16 in chest). At the high end, expect the small band (16–22 in chest). One Shih Tzu does not size the next—the tape replaces the breed name.

The build to expect is a small neck under a topknot and a beard. A common miss on harnesses for this shape is related to how people already mishandle the neck: starting the tape up in the topknot instead of under the jaw. For the chest strap, keep the tape level and on the ribs, not on the coat.

The topknot is hair. The neck measurement starts where a flat collar closes. If the strap sits on the soft belly or slides into the armpits, remeasure the deepest rib and move up or down one band—do not yank the neck strap tighter to compensate.

Chest girth and neck circumference are different measurements. Use the rib tape for harness bands; use the collar line for tied bandanas on the bandana calculator.