noun
indoor cat; house cat
A cat kept entirely indoors, as opposed to an outdoor cat (外猫). Common in pet care contexts.
See also: 外猫
うちの内猫は外に出たがらない。
Our indoor cat doesn't want to go outside.
内猫の健康管理は外猫と少し違う。
Health management for indoor cats is a little different from that for outdoor cats.