YOU SAID:

They are going there with their pet hare

INTO JAPANESE

彼らはペットの手持ちでそこに行く

BACK INTO ENGLISH

They go there with their pets on hand.

INTO JAPANESE

彼らはペットを手にしてそこに行きます。

BACK INTO ENGLISH

They go there with their pets in their hands.

INTO JAPANESE

彼らはペットを手にしてそこに行きます。

BACK INTO ENGLISH

They go there with their pets in their hands.