YOU SAID:

The runner ran with a runny nose until he saw a car run down a dog with the runs

INTO JAPANESE

走者は、走る犬が車を走るのを見るまで鼻水で走りました

BACK INTO ENGLISH

The runner ran with a runny nose until he saw the running dog run in the car

INTO JAPANESE

走っている犬が車の中で走るのを見るまで、ランナーは鼻水で走りました

BACK INTO ENGLISH

The runner ran with a runny nose until he saw the running dog run in the car