KKA: Height roughly 40cm (15”) – 50cm (19.5”) at withers http://www.yamabushikennel.org/standards.php
NIPPO: Male standard height: 52cm (20”) Female standard height: 49cm (19”) is a female. On average, males 49cm (19”) from 55cm (21”), and female 46cm (18”) to 52cm (20”). http://www.nihonken-hozonkai.or.jp
*NIPPO standard for Kai has been temporarily lowered by 2cm. So male bottom end is 47cm, female 44cm.
FCI: Dogs 53 cm (approx. 20-21 inches) Bitches 48 cm (approx. 18-19 inches) http://www.yamabushikennel.org/fci/kai_standards_FCI.pdf
UKC: Desirable height, measured at the withers, ranges from 18½ to 22 inches (47cm-55.9cm) for males, and 17½ to 20 inches (44.5cm-50.8cm) for females. Weight ranges from 25 to 55 pounds. http://www.ukcdogs.com/WebSite.nsf/Breeds/KaiRevisedJuly12008
Desirable height for males 50cm, females 45cm. Allowance +-3cm (males 47-53cm, females 42-48cm).