YOU SAID:

The dog had to use the bathroom but the cat said no

INTO JAPANESE

犬はトイレに行かなければならなかったが、猫はトイレに行きたくないと言った

BACK INTO ENGLISH

The dog had to go to the bathroom, but the cat said he didn't want to go to the bathroom.

INTO JAPANESE

犬はトイレに行かなければなりませんでしたが、猫はトイレに行きたくないと言いました。

BACK INTO ENGLISH

The dog had to go to the bathroom, but the cat said he didn't want to go to the bathroom.