YOU SAID:

does that stupid dog even realise it's playing with it's own tail

INTO JAPANESE

あの愚かな犬は自分の尻尾で遊んでいることに気づいているのだろうか

BACK INTO ENGLISH

Does that stupid dog realize he's playing with his tail?

INTO JAPANESE

あの愚かな犬は自分が尻尾で遊んでいることに気づいているのだろうか？

BACK INTO ENGLISH

Does that stupid dog realize he's playing with his tail?