Shih Tzu: crate, bed and harness size
AKC weight: 9-16 pounds (AKC Breed Weight Chart). The Shih Tzu is #21 in AKC's 2025 ranking (AKC).
Crate: 24" crate (MidWest iCrate Dog Crate Size Guide (manufacturer PDF))
Bed: Small rectangle bed (28 x 18 in) (Orvis Dog Product Sizing Guide (Rectangle bed))
Harness: Measure your dog's chest girth, then check the Ruffwear girth chart. No breed standard lists girth.
Photo: Canino21, Public domain, via Wikimedia Commons (cropped).