The cheeks are well developed. When viewed from the side, the muzzle is moderately thick. It should be well filled in under the eyes. The nasal bridge is straight. The lower jaw is strong and blunt but not protruding.
Lips are black and tightly closed.
The Kai has a complete set of good-size, evenly spaced, white teeth. A scissors bite is preferred but a level bite is acceptable. The tongue is generally spotted but may be pink or blue black. Overshot or undershot bite. More than four missing teeth.