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
Our indoor cat doesn't want to go outside.
Health management for indoor cats is a little different from that for outdoor cats.
Compound of 内 (uchi, 'inside') and 猫 (neko, 'cat'). A straightforward modern coinage.