Vocabulary What does 飼い犬 (かいいぬ, kaiinu) mean? 飼い犬 (かいいぬ, kaiinu) means pet dog. Quick factsReadingかいいぬRomajikaiinuPart of speechnoun 飼い犬かいいぬkaiinupet dog1noun pet dogAlso written: 飼犬Kanji in this word飼raising, keeping (animals)犬dog