YOU SAID:
surfing Pikachu was eating doge
INTO JAPANESE
サーフィンピカチュウはdogeを食べていた
BACK INTO ENGLISH
Surfing Pikachu was eating doge
INTO JAPANESE
サーフィンピカチュウはドッグを食べていた
BACK INTO ENGLISH
Surfing Pikachu was eating a dog
INTO JAPANESE
サーフィンピカチュウは犬を食べていた
BACK INTO ENGLISH
Surfing Pikachu was eating a dog
That didn't even make that much sense in English.