It was after the Pacific War that this trend occurred most eminently, when ordinary citizens were allowed to keep (buy) pets easily and many exotic breeds came to be kept in Japan.
この傾向が最も激しく起こったのは太平洋戦争後で、一般市民が手軽にペットを飼う（買う）ことができるようになり、外来種が多く日本で飼われるようになった。