YOU SAID:

My uncle's dog is actually not a dog, it's a fish, I think.

INTO JAPANESE

私の叔父の犬は実際には犬ではなく、魚です、と私は思います。

BACK INTO ENGLISH

I think that my uncle's dog is actually a fish, not a dog.

INTO JAPANESE

私の叔父の犬は実際犬ではなく魚であると思います。

BACK INTO ENGLISH

I think that my uncle's dog is actually a fish, not a dog.