YOU SAID:

I have two dogs, but one of them is not pretty.

INTO JAPANESE

私は2匹の犬を飼っていますが、そのうちの1匹はきれいではありません。

BACK INTO ENGLISH

I have two dogs, one of which is not beautiful.

INTO JAPANESE

私は2匹の犬を飼っていますが、そのうちの1匹は美しくありません。

BACK INTO ENGLISH

I have two dogs, one of which is not beautiful.