YOU SAID:

i went to the park today and found a dog so i walked the dog

INTO JAPANESE

今日公園に行って犬を見つけたので、犬を散歩させた

BACK INTO ENGLISH

I went to the park today and found the dog, so I let him walk

INTO JAPANESE

私は今日公園に行って犬を見つけたので、彼を歩かせた

BACK INTO ENGLISH

I went to the park today and found the dog, so I let him walk