の尻尾

one's tail

→ の
phrase Rare #29,228
one's tail の marks possession, and 尻尾 means “tail.” The word 尻尾 is also commonly written as しっぽ.
JA: 犬の尻尾が大きく揺れている。
EN: The dog's tail is wagging a lot.

の尻尾は長い

A cow's tail is long.

少年はねずみの尻尾をつかんでいた

The boy was holding the mouse by its tail.

男の子はの尻尾を掴んだ

The boy grabbed the cat's tail.