YOU SAID:

I have a dog that needs to be potty trained.

INTO JAPANESE

私はトイレを訓練する必要がある犬を飼っています。

BACK INTO ENGLISH

I have a dog that needs to be trained in the bathroom.

INTO JAPANESE

私はトイレで訓練を受ける必要がある犬を飼っています。

BACK INTO ENGLISH

I have a dog that needs to be trained in the bathroom.