YOU SAID:

my cat pooped on the floor and i had to train him not to do that

INTO JAPANESE

私の猫は床にうんちをして、私はそれをしないように彼を訓練しなければならなかった

BACK INTO ENGLISH

My cat pooped on the floor and I had to train him not to do it

INTO JAPANESE

私の猫は床にうんちをして、私はそれをしないように彼を訓練しなければならなかった

BACK INTO ENGLISH

My cat pooped on the floor and I had to train him not to do it